diff --git a/prisma/migrations/20260623175315_add_store_image_and_detail_columns/migration.sql b/prisma/migrations/20260623175315_add_store_image_and_detail_columns/migration.sql
new file mode 100644
index 0000000..d93b60e
--- /dev/null
+++ b/prisma/migrations/20260623175315_add_store_image_and_detail_columns/migration.sql
@@ -0,0 +1,21 @@
+-- AlterTable
+ALTER TABLE `store` ADD COLUMN `access_guide_text` VARCHAR(500) NULL,
+    ADD COLUMN `regular_closure_text` VARCHAR(200) NULL;
+
+-- CreateTable
+CREATE TABLE `store_image` (
+    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+    `store_id` BIGINT UNSIGNED NOT NULL,
+    `image_url` VARCHAR(2048) NOT NULL,
+    `sort_order` INTEGER NOT NULL DEFAULT 0,
+    `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    `updated_at` DATETIME(3) NOT NULL,
+    `deleted_at` DATETIME(3) NULL,
+
+    INDEX `idx_store_image_store`(`store_id`, `sort_order`),
+    INDEX `idx_store_image_deleted_at`(`deleted_at`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- AddForeignKey
+ALTER TABLE `store_image` ADD CONSTRAINT `store_image_store_id_fkey` FOREIGN KEY (`store_id`) REFERENCES `store`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index bab4b8d..445240e 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -342,7 +342,9 @@ model Store {
 
   map_provider StoreMapProvider @default(NONE)
 
-  business_hours_text String? @db.VarChar(500)
+  business_hours_text  String? @db.VarChar(500)
+  access_guide_text    String? @db.VarChar(500) // 찾아오는 길 안내("냉삼 꽃삼겹 골목으로 바로...")
+  regular_closure_text String? @db.VarChar(200) // 정기 휴무 표기(자유 텍스트, "매주 2,4주 월요일 쉽니다")
 
   pickup_slot_interval_minutes Int @default(30) @db.UnsignedSmallInt
   min_lead_time_minutes        Int @default(30) @db.UnsignedInt
@@ -361,6 +363,7 @@ model Store {
   business_hours   StoreBusinessHour[]
   special_closures StoreSpecialClosure[]
   products         Product[]
+  store_images     StoreImage[]
   order_items      OrderItem[]
   reviews          Review[]
   banners          Banner[]              @relation("BannerStoreLink")
@@ -418,6 +421,24 @@ model StoreSpecialClosure {
   @@map("store_special_closure")
 }
 
+model StoreImage {
+  id       BigInt @id @default(autoincrement()) @db.UnsignedBigInt
+  store_id BigInt @db.UnsignedBigInt
+
+  image_url  String @db.VarChar(2048)
+  sort_order Int    @default(0)
+
+  created_at DateTime  @default(now()) @db.DateTime(3)
+  updated_at DateTime  @updatedAt @db.DateTime(3)
+  deleted_at DateTime? @db.DateTime(3)
+
+  store Store @relation(fields: [store_id], references: [id])
+
+  @@index([store_id, sort_order], map: "idx_store_image_store")
+  @@index([deleted_at], map: "idx_store_image_deleted_at")
+  @@map("store_image")
+}
+
 /**
  * =========================
  * 3) Catalog
diff --git a/prisma/seed/idempotent.ts b/prisma/seed/idempotent.ts
index aac045a..ee052cb 100644
--- a/prisma/seed/idempotent.ts
+++ b/prisma/seed/idempotent.ts
@@ -238,6 +238,10 @@ export async function resetSeedScope(prisma: PrismaClient): Promise<void> {
     await prisma.storeSpecialClosure.deleteMany({
       where: { store_id: { in: storeIds } },
     });
+    // store_image FK는 ON DELETE RESTRICT → store 삭제 전에 정리해야 재시드 멱등성 유지
+    await prisma.storeImage.deleteMany({
+      where: { store_id: { in: storeIds } },
+    });
     await prisma.store.deleteMany({ where: { id: { in: storeIds } } });
   }
 
diff --git a/prisma/seed/stores.ts b/prisma/seed/stores.ts
index adffa16..90ab901 100644
--- a/prisma/seed/stores.ts
+++ b/prisma/seed/stores.ts
@@ -50,8 +50,24 @@ export async function seedStores(prisma: PrismaClient): Promise<SeededStores> {
       region_id: gangnam.id, // 서울 강남구
       latitude: 37.5012 as unknown as never,
       longitude: 127.0396 as unknown as never,
+      map_provider: 'NAVER',
       business_hours_text: '매일 09:00 ~ 18:00 (화요일 정기 휴무)',
+      access_guide_text:
+        '강남역 3번 출구에서 도보 5분, 1층 케이크 거리 안쪽입니다.',
+      regular_closure_text: '매주 화요일 정기 휴무',
       is_active: true,
+      store_images: {
+        create: [
+          {
+            image_url: 'https://placehold.co/800x600/png?text=Store+A+Exterior',
+            sort_order: 0,
+          },
+          {
+            image_url: 'https://placehold.co/800x600/png?text=Store+A+Interior',
+            sort_order: 1,
+          },
+        ],
+      },
     },
   });
 
diff --git a/src/features/store/constants/store-detail-error-messages.ts b/src/features/store/constants/store-detail-error-messages.ts
new file mode 100644
index 0000000..c0e0491
--- /dev/null
+++ b/src/features/store/constants/store-detail-error-messages.ts
@@ -0,0 +1,4 @@
+/** 매장 상세 조회 에러 메시지. */
+export const STORE_DETAIL_ERRORS = {
+  STORE_NOT_FOUND: '매장을 찾을 수 없습니다.',
+} as const;
diff --git a/src/features/store/repositories/store.repository.ts b/src/features/store/repositories/store.repository.ts
index 44d55ff..0158c03 100644
--- a/src/features/store/repositories/store.repository.ts
+++ b/src/features/store/repositories/store.repository.ts
@@ -1,4 +1,5 @@
 import { Injectable } from '@nestjs/common';
+import { Prisma, type StoreMapProvider } from '@prisma/client';
 
 import {
   POPULAR_STORE_CAKE_IMAGE_LIMIT,
@@ -19,6 +20,25 @@ export interface StoreReviewStat {
   count: number;
 }
 
+/** 매장 상세 조회 결과 row. storeDetail 매퍼 입력. */
+export interface StoreDetailRow {
+  id: bigint;
+  store_name: string;
+  store_phone: string;
+  address_full: string;
+  address_city: string | null;
+  address_neighborhood: string | null;
+  latitude: Prisma.Decimal | null;
+  longitude: Prisma.Decimal | null;
+  map_provider: StoreMapProvider;
+  business_hours_text: string | null;
+  access_guide_text: string | null;
+  regular_closure_text: string | null;
+  website_url: string | null;
+  region: { name: string } | null;
+  store_images: { image_url: string }[];
+}
+
 @Injectable()
 export class StoreRepository {
   constructor(private readonly prisma: PrismaService) {}
@@ -54,6 +74,34 @@ export class StoreRepository {
     return Boolean(found);
   }
 
+  /** 매장 상세 헤더 조회. 활성·미삭제 매장만. 대표 이미지는 sort_order asc. */
+  async findStoreDetailById(storeId: bigint): Promise<StoreDetailRow | null> {
+    return this.prisma.store.findFirst({
+      where: { id: storeId, is_active: true, deleted_at: null },
+      select: {
+        id: true,
+        store_name: true,
+        store_phone: true,
+        address_full: true,
+        address_city: true,
+        address_neighborhood: true,
+        latitude: true,
+        longitude: true,
+        map_provider: true,
+        business_hours_text: true,
+        access_guide_text: true,
+        regular_closure_text: true,
+        website_url: true,
+        region: { select: { name: true } },
+        store_images: {
+          where: { deleted_at: null },
+          orderBy: { sort_order: 'asc' },
+          select: { image_url: true },
+        },
+      },
+    });
+  }
+
   /** 매장별 활성 찜 수. */
   async aggregateWishlistCounts(
     storeIds: bigint[],
diff --git a/src/features/store/resolvers/store-detail-query.resolver.spec.ts b/src/features/store/resolvers/store-detail-query.resolver.spec.ts
new file mode 100644
index 0000000..b573ba6
--- /dev/null
+++ b/src/features/store/resolvers/store-detail-query.resolver.spec.ts
@@ -0,0 +1,77 @@
+import { NotFoundException } from '@nestjs/common';
+import type { PrismaClient } from '@prisma/client';
+
+import { StoreWishlistRepository } from '@/features/store/repositories/store-wishlist.repository';
+import { StoreRepository } from '@/features/store/repositories/store.repository';
+import { StoreDetailQueryResolver } from '@/features/store/resolvers/store-detail-query.resolver';
+import { StoreDetailService } from '@/features/store/services/store-detail.service';
+import { disconnectTestPrismaClient } from '@/test/db/prisma-test-client';
+import { closeTruncateConnection, truncateAll } from '@/test/db/truncate';
+import {
+  createAccount,
+  createStore,
+  createStoreWishlist,
+} from '@/test/factories';
+import { createTestingModuleWithRealDb } from '@/test/modules/testing-module.builder';
+
+/**
+ * Resolver ↔ Service ↔ Repository ↔ DB 통합 경로 검증.
+ * 분기/집계 세부 검증은 service.spec.ts에서 담당.
+ */
+describe('Store Detail Query Resolver (real DB)', () => {
+  let resolver: StoreDetailQueryResolver;
+  let prisma: PrismaClient;
+
+  beforeAll(async () => {
+    const { module, prisma: p } = await createTestingModuleWithRealDb({
+      providers: [
+        StoreDetailQueryResolver,
+        StoreDetailService,
+        StoreRepository,
+        StoreWishlistRepository,
+      ],
+    });
+    resolver = module.get(StoreDetailQueryResolver);
+    prisma = p;
+  });
+
+  afterAll(async () => {
+    await closeTruncateConnection();
+    await disconnectTestPrismaClient();
+  });
+
+  beforeEach(async () => {
+    await truncateAll();
+  });
+
+  it('storeDetail: 비로그인 사용자에게 매장 상세를 반환한다', async () => {
+    const store = await createStore(prisma, { store_name: '해즈케이크' });
+
+    const result = await resolver.storeDetail(store.id.toString(), undefined);
+
+    expect(result.id).toBe(store.id.toString());
+    expect(result.storeName).toBe('해즈케이크');
+    expect(result.isWishlisted).toBe(false);
+  });
+
+  it('storeDetail: 로그인 사용자(JwtUser)의 찜 여부를 채운다', async () => {
+    const account = await createAccount(prisma, { account_type: 'USER' });
+    const store = await createStore(prisma);
+    await createStoreWishlist(prisma, {
+      account_id: account.id,
+      store_id: store.id,
+    });
+
+    const result = await resolver.storeDetail(store.id.toString(), {
+      accountId: account.id.toString(),
+    });
+
+    expect(result.isWishlisted).toBe(true);
+  });
+
+  it('storeDetail: 없는 매장은 NotFoundException', async () => {
+    await expect(
+      resolver.storeDetail('999999', undefined),
+    ).rejects.toBeInstanceOf(NotFoundException);
+  });
+});
diff --git a/src/features/store/resolvers/store-detail-query.resolver.ts b/src/features/store/resolvers/store-detail-query.resolver.ts
new file mode 100644
index 0000000..8532cef
--- /dev/null
+++ b/src/features/store/resolvers/store-detail-query.resolver.ts
@@ -0,0 +1,30 @@
+import { UseGuards } from '@nestjs/common';
+import { Args, Query, Resolver } from '@nestjs/graphql';
+
+import { StoreDetailService } from '@/features/store/services/store-detail.service';
+import type { StoreDetail } from '@/features/store/types/store-detail-output.type';
+import {
+  CurrentUser,
+  OptionalJwtAuthGuard,
+  parseAccountId,
+  type JwtUser,
+} from '@/global/auth';
+
+/**
+ * 매장 상세 조회 resolver. 비로그인도 접근 가능한 public query.
+ * 옵셔널 인증으로 로그인 시에만 isWishlisted를 채운다.
+ */
+@Resolver('Query')
+export class StoreDetailQueryResolver {
+  constructor(private readonly storeDetailService: StoreDetailService) {}
+
+  @Query('storeDetail')
+  @UseGuards(OptionalJwtAuthGuard)
+  storeDetail(
+    @Args('storeId') storeId: string,
+    @CurrentUser() user: JwtUser | undefined,
+  ): Promise<StoreDetail> {
+    const accountId = user ? parseAccountId(user) : undefined;
+    return this.storeDetailService.storeDetail(storeId, accountId);
+  }
+}
diff --git a/src/features/store/services/store-detail-mappers.helper.spec.ts b/src/features/store/services/store-detail-mappers.helper.spec.ts
new file mode 100644
index 0000000..e7d118d
--- /dev/null
+++ b/src/features/store/services/store-detail-mappers.helper.spec.ts
@@ -0,0 +1,129 @@
+import { Prisma } from '@prisma/client';
+
+import type {
+  StoreDetailRow,
+  StoreReviewStat,
+} from '@/features/store/repositories/store.repository';
+import { toStoreDetail } from '@/features/store/services/store-detail-mappers.helper';
+
+function makeRow(overrides: Partial<StoreDetailRow> = {}): StoreDetailRow {
+  return {
+    id: 1n,
+    store_name: '해즈케이크',
+    store_phone: '05930905934',
+    address_full: '인천 서구 청라루비로 93',
+    address_city: '인천광역시',
+    address_neighborhood: '청라동',
+    latitude: null,
+    longitude: null,
+    map_provider: 'NONE',
+    business_hours_text: '10:00AM ~ 19:00PM',
+    access_guide_text: '냉삼 꽃삼겹 골목으로 바로 들어오시면 있습니다.',
+    regular_closure_text: '매주 2,4주 월요일 쉽니다',
+    website_url: null,
+    region: null,
+    store_images: [],
+    ...overrides,
+  };
+}
+
+describe('toStoreDetail', () => {
+  it('row를 StoreDetail로 매핑한다(id 문자열, 이미지 url 배열, 신규 필드 포함)', () => {
+    const result = toStoreDetail(
+      makeRow({
+        store_images: [{ image_url: 'a.png' }, { image_url: 'b.png' }],
+        website_url: 'https://store.example',
+      }),
+      undefined,
+      false,
+    );
+
+    expect(result).toMatchObject({
+      id: '1',
+      storeName: '해즈케이크',
+      phoneNumber: '05930905934',
+      addressFull: '인천 서구 청라루비로 93',
+      images: ['a.png', 'b.png'],
+      mapProvider: 'NONE',
+      businessHoursText: '10:00AM ~ 19:00PM',
+      accessGuideText: '냉삼 꽃삼겹 골목으로 바로 들어오시면 있습니다.',
+      regularClosureText: '매주 2,4주 월요일 쉽니다',
+      websiteUrl: 'https://store.example',
+    });
+  });
+
+  it('regionLabel: 시/동 우선, 없으면 region.name, 둘 다 없으면 null', () => {
+    expect(
+      toStoreDetail(
+        makeRow({ address_city: '인천', address_neighborhood: '청라동' }),
+        undefined,
+        false,
+      ).regionLabel,
+    ).toBe('인천 청라동');
+
+    expect(
+      toStoreDetail(
+        makeRow({
+          address_city: null,
+          address_neighborhood: null,
+          region: { name: '서구' },
+        }),
+        undefined,
+        false,
+      ).regionLabel,
+    ).toBe('서구');
+
+    expect(
+      toStoreDetail(
+        makeRow({
+          address_city: null,
+          address_neighborhood: null,
+          region: null,
+        }),
+        undefined,
+        false,
+      ).regionLabel,
+    ).toBeNull();
+  });
+
+  it('평점은 소수 첫째 자리로 반올림하고 리뷰 수를 채운다', () => {
+    const stat: StoreReviewStat = { average: 4.666, count: 122 };
+    const result = toStoreDetail(makeRow(), stat, false);
+    expect(result.ratingAverage).toBe(4.7);
+    expect(result.reviewCount).toBe(122);
+  });
+
+  it('리뷰 통계가 없으면 평점 0, 리뷰 수 0', () => {
+    const result = toStoreDetail(makeRow(), undefined, false);
+    expect(result.ratingAverage).toBe(0);
+    expect(result.reviewCount).toBe(0);
+  });
+
+  it('좌표 Decimal은 number로 변환하고 null은 유지한다', () => {
+    const withCoord = toStoreDetail(
+      makeRow({
+        latitude: new Prisma.Decimal('37.5012'),
+        longitude: new Prisma.Decimal('127.0396'),
+      }),
+      undefined,
+      false,
+    );
+    expect(withCoord.latitude).toBeCloseTo(37.5012);
+    expect(withCoord.longitude).toBeCloseTo(127.0396);
+
+    const noCoord = toStoreDetail(makeRow(), undefined, false);
+    expect(noCoord.latitude).toBeNull();
+    expect(noCoord.longitude).toBeNull();
+  });
+
+  it('isWishlisted 인자를 그대로 반영한다', () => {
+    expect(toStoreDetail(makeRow(), undefined, true).isWishlisted).toBe(true);
+    expect(toStoreDetail(makeRow(), undefined, false).isWishlisted).toBe(false);
+  });
+
+  it('이미지가 없으면 빈 배열', () => {
+    expect(
+      toStoreDetail(makeRow({ store_images: [] }), undefined, false).images,
+    ).toEqual([]);
+  });
+});
diff --git a/src/features/store/services/store-detail-mappers.helper.ts b/src/features/store/services/store-detail-mappers.helper.ts
new file mode 100644
index 0000000..94eca81
--- /dev/null
+++ b/src/features/store/services/store-detail-mappers.helper.ts
@@ -0,0 +1,42 @@
+import type {
+  StoreDetailRow,
+  StoreReviewStat,
+} from '@/features/store/repositories/store.repository';
+import { buildRegionLabel } from '@/features/store/services/store-mappers.helper';
+import type { StoreDetail } from '@/features/store/types/store-detail-output.type';
+
+/** 소수 첫째 자리 반올림(예: 4.666 → 4.7). 리뷰 없으면 0. */
+function toRatingAverage(stat: StoreReviewStat | undefined): number {
+  if (!stat) return 0;
+  return Math.round(stat.average * 10) / 10;
+}
+
+/** Decimal(위/경도)을 number로. null은 유지. */
+function toCoordinate(value: { toString(): string } | null): number | null {
+  return value !== null ? Number(value) : null;
+}
+
+export function toStoreDetail(
+  row: StoreDetailRow,
+  reviewStat: StoreReviewStat | undefined,
+  isWishlisted: boolean,
+): StoreDetail {
+  return {
+    id: row.id.toString(),
+    storeName: row.store_name,
+    regionLabel: buildRegionLabel(row),
+    ratingAverage: toRatingAverage(reviewStat),
+    reviewCount: reviewStat?.count ?? 0,
+    isWishlisted,
+    images: row.store_images.map((image) => image.image_url),
+    phoneNumber: row.store_phone,
+    addressFull: row.address_full,
+    latitude: toCoordinate(row.latitude),
+    longitude: toCoordinate(row.longitude),
+    mapProvider: row.map_provider,
+    businessHoursText: row.business_hours_text,
+    regularClosureText: row.regular_closure_text,
+    accessGuideText: row.access_guide_text,
+    websiteUrl: row.website_url,
+  };
+}
diff --git a/src/features/store/services/store-detail.service.spec.ts b/src/features/store/services/store-detail.service.spec.ts
new file mode 100644
index 0000000..a87b514
--- /dev/null
+++ b/src/features/store/services/store-detail.service.spec.ts
@@ -0,0 +1,152 @@
+import { BadRequestException, NotFoundException } from '@nestjs/common';
+import type { PrismaClient } from '@prisma/client';
+
+import { StoreWishlistRepository } from '@/features/store/repositories/store-wishlist.repository';
+import { StoreRepository } from '@/features/store/repositories/store.repository';
+import { StoreDetailService } from '@/features/store/services/store-detail.service';
+import { disconnectTestPrismaClient } from '@/test/db/prisma-test-client';
+import { closeTruncateConnection, truncateAll } from '@/test/db/truncate';
+import {
+  createAccount,
+  createOrderItem,
+  createReview,
+  createStore,
+  createStoreWishlist,
+} from '@/test/factories';
+import { createTestingModuleWithRealDb } from '@/test/modules/testing-module.builder';
+
+describe('StoreDetailService (real DB)', () => {
+  let service: StoreDetailService;
+  let prisma: PrismaClient;
+
+  beforeAll(async () => {
+    const { module, prisma: p } = await createTestingModuleWithRealDb({
+      providers: [StoreDetailService, StoreRepository, StoreWishlistRepository],
+    });
+    service = module.get(StoreDetailService);
+    prisma = p;
+  });
+
+  afterAll(async () => {
+    await closeTruncateConnection();
+    await disconnectTestPrismaClient();
+  });
+
+  beforeEach(async () => {
+    await truncateAll();
+  });
+
+  it('존재하지 않는 매장은 NotFoundException', async () => {
+    await expect(service.storeDetail('999999')).rejects.toBeInstanceOf(
+      NotFoundException,
+    );
+  });
+
+  it('비활성 매장은 NotFoundException', async () => {
+    const store = await createStore(prisma, { is_active: false });
+    await expect(
+      service.storeDetail(store.id.toString()),
+    ).rejects.toBeInstanceOf(NotFoundException);
+  });
+
+  it('잘못된 id 형식은 BadRequestException', async () => {
+    await expect(service.storeDetail('abc')).rejects.toBeInstanceOf(
+      BadRequestException,
+    );
+  });
+
+  it('매장 헤더와 신규 필드, 이미지(sort_order asc)를 반환한다', async () => {
+    const store = await createStore(prisma, {
+      store_name: '해즈케이크',
+      store_phone: '05930905934',
+      address_full: '인천 서구 청라루비로 93',
+      address_city: '인천광역시',
+      address_neighborhood: '청라동',
+      latitude: 37.5,
+      longitude: 127.0,
+      map_provider: 'NAVER',
+      business_hours_text: '10:00AM ~ 19:00PM',
+      access_guide_text: '냉삼 꽃삼겹 골목으로 바로 들어오시면 있습니다.',
+      regular_closure_text: '매주 2,4주 월요일 쉽니다',
+    });
+    // sort_order 역순으로 생성 → 결과는 asc 정렬 확인
+    await prisma.storeImage.create({
+      data: { store_id: store.id, image_url: 'second.png', sort_order: 1 },
+    });
+    await prisma.storeImage.create({
+      data: { store_id: store.id, image_url: 'first.png', sort_order: 0 },
+    });
+
+    const result = await service.storeDetail(store.id.toString());
+
+    expect(result).toMatchObject({
+      id: store.id.toString(),
+      storeName: '해즈케이크',
+      phoneNumber: '05930905934',
+      addressFull: '인천 서구 청라루비로 93',
+      regionLabel: '인천광역시 청라동',
+      mapProvider: 'NAVER',
+      businessHoursText: '10:00AM ~ 19:00PM',
+      accessGuideText: '냉삼 꽃삼겹 골목으로 바로 들어오시면 있습니다.',
+      regularClosureText: '매주 2,4주 월요일 쉽니다',
+      isWishlisted: false,
+    });
+    expect(result.images).toEqual(['first.png', 'second.png']);
+    expect(result.latitude).toBeCloseTo(37.5);
+    expect(result.longitude).toBeCloseTo(127.0);
+  });
+
+  it('soft-delete된 이미지는 제외한다', async () => {
+    const store = await createStore(prisma);
+    await prisma.storeImage.create({
+      data: { store_id: store.id, image_url: 'visible.png', sort_order: 0 },
+    });
+    await prisma.storeImage.create({
+      data: {
+        store_id: store.id,
+        image_url: 'deleted.png',
+        sort_order: 1,
+        deleted_at: new Date(),
+      },
+    });
+
+    const result = await service.storeDetail(store.id.toString());
+
+    expect(result.images).toEqual(['visible.png']);
+  });
+
+  it('평균 평점(소수 첫째)과 리뷰 수를 집계한다', async () => {
+    const store = await createStore(prisma);
+    for (const rating of [4, 5]) {
+      const orderItem = await createOrderItem(prisma, { store_id: store.id });
+      await createReview(prisma, { order_item_id: orderItem.id, rating });
+    }
+
+    const result = await service.storeDetail(store.id.toString());
+
+    expect(result.ratingAverage).toBe(4.5);
+    expect(result.reviewCount).toBe(2);
+  });
+
+  it('리뷰가 없으면 평점 0, 리뷰 수 0', async () => {
+    const store = await createStore(prisma);
+    const result = await service.storeDetail(store.id.toString());
+    expect(result.ratingAverage).toBe(0);
+    expect(result.reviewCount).toBe(0);
+  });
+
+  it('로그인 사용자의 찜 매장은 isWishlisted=true, 비로그인은 false', async () => {
+    const account = await createAccount(prisma, { account_type: 'USER' });
+    const store = await createStore(prisma);
+    await createStoreWishlist(prisma, {
+      account_id: account.id,
+      store_id: store.id,
+    });
+
+    const loggedIn = await service.storeDetail(store.id.toString(), account.id);
+    expect(loggedIn.isWishlisted).toBe(true);
+
+    const anonymous = await service.storeDetail(store.id.toString());
+    expect(anonymous.isWishlisted).toBe(false);
+  });
+});
diff --git a/src/features/store/services/store-detail.service.ts b/src/features/store/services/store-detail.service.ts
new file mode 100644
index 0000000..e9c6830
--- /dev/null
+++ b/src/features/store/services/store-detail.service.ts
@@ -0,0 +1,47 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+
+import { parseId } from '@/common/utils/id-parser';
+import { STORE_DETAIL_ERRORS } from '@/features/store/constants/store-detail-error-messages';
+import { StoreWishlistRepository } from '@/features/store/repositories/store-wishlist.repository';
+import { StoreRepository } from '@/features/store/repositories/store.repository';
+import { toStoreDetail } from '@/features/store/services/store-detail-mappers.helper';
+import type { StoreDetail } from '@/features/store/types/store-detail-output.type';
+
+@Injectable()
+export class StoreDetailService {
+  constructor(
+    private readonly repo: StoreRepository,
+    private readonly wishlistRepo: StoreWishlistRepository,
+  ) {}
+
+  /**
+   * 매장 상세 헤더. 비활성/삭제 매장은 NOT_FOUND. 평점·리뷰수는 실시간 집계하고,
+   * isWishlisted는 로그인 사용자에 한해 채운다(비로그인 false).
+   */
+  async storeDetail(
+    storeIdRaw: string,
+    accountId?: bigint,
+  ): Promise<StoreDetail> {
+    const storeId = parseId(storeIdRaw);
+    const row = await this.repo.findStoreDetailById(storeId);
+    if (!row) {
+      throw new NotFoundException(STORE_DETAIL_ERRORS.STORE_NOT_FOUND);
+    }
+
+    const [reviewStats, wishlistedIds] = await Promise.all([
+      this.repo.aggregateReviewStats([storeId]),
+      accountId
+        ? this.wishlistRepo.findWishlistedStoreIds({
+            accountId,
+            storeIds: [storeId],
+          })
+        : Promise.resolve(new Set<string>()),
+    ]);
+
+    return toStoreDetail(
+      row,
+      reviewStats.get(storeId),
+      wishlistedIds.has(storeId.toString()),
+    );
+  }
+}
diff --git a/src/features/store/services/store-mappers.helper.ts b/src/features/store/services/store-mappers.helper.ts
index 4d7720c..4f1c737 100644
--- a/src/features/store/services/store-mappers.helper.ts
+++ b/src/features/store/services/store-mappers.helper.ts
@@ -3,7 +3,11 @@ import type { StoreMetrics } from '@/features/store/services/store-ranking.helpe
 import type { PopularStore } from '@/features/store/types/store-output.type';
 
 /** 매장 위치 표기. 시/동 조합 우선, 없으면 2차 지역명. (표기 규칙 확정 전 기본형) */
-export function buildRegionLabel(row: StoreCandidateRow): string | null {
+export function buildRegionLabel(row: {
+  address_city: string | null;
+  address_neighborhood: string | null;
+  region: { name: string } | null;
+}): string | null {
   const parts = [row.address_city, row.address_neighborhood].filter(
     (p): p is string => Boolean(p),
   );
diff --git a/src/features/store/store-detail.graphql b/src/features/store/store-detail.graphql
new file mode 100644
index 0000000..36c8fe6
--- /dev/null
+++ b/src/features/store/store-detail.graphql
@@ -0,0 +1,42 @@
+extend type Query {
+  """매장 상세 헤더. 없거나 비활성/삭제 매장이면 NOT_FOUND. 비로그인 접근 가능."""
+  storeDetail(storeId: ID!): StoreDetail!
+}
+
+"""매장 상세 헤더(구매자용)."""
+type StoreDetail {
+  id: ID!
+  storeName: String!
+  """매장 위치 표기(예: 인천 청라동)."""
+  regionLabel: String
+  """평균 평점(0.0~5.0, 소수 첫째 자리)."""
+  ratingAverage: Float!
+  reviewCount: Int!
+  """로그인 사용자의 찜 여부(비로그인 시 false)."""
+  isWishlisted: Boolean!
+  """매장 대표 이미지(캐러셀, sort_order asc)."""
+  images: [String!]!
+  """매장 전화번호(전화 액션시트)."""
+  phoneNumber: String!
+  """전체 주소(표시·복사용)."""
+  addressFull: String!
+  """위도(지도). 미설정 시 null."""
+  latitude: Float
+  """경도(지도). 미설정 시 null."""
+  longitude: Float
+  mapProvider: StoreMapProvider!
+  """영업시간 표기 텍스트(예: 10:00AM ~ 19:00PM)."""
+  businessHoursText: String
+  """정기 휴무 표기(예: 매주 2,4주 월요일 쉽니다)."""
+  regularClosureText: String
+  """찾아오는 길 안내."""
+  accessGuideText: String
+  websiteUrl: String
+}
+
+"""매장 지도 연동 provider."""
+enum StoreMapProvider {
+  NAVER
+  KAKAO
+  NONE
+}
diff --git a/src/features/store/store.module.ts b/src/features/store/store.module.ts
index a817aa1..e025622 100644
--- a/src/features/store/store.module.ts
+++ b/src/features/store/store.module.ts
@@ -2,8 +2,10 @@ import { Module } from '@nestjs/common';
 
 import { StoreWishlistRepository } from '@/features/store/repositories/store-wishlist.repository';
 import { StoreRepository } from '@/features/store/repositories/store.repository';
+import { StoreDetailQueryResolver } from '@/features/store/resolvers/store-detail-query.resolver';
 import { StoreQueryResolver } from '@/features/store/resolvers/store-query.resolver';
 import { StoreWishlistMutationResolver } from '@/features/store/resolvers/store-wishlist-mutation.resolver';
+import { StoreDetailService } from '@/features/store/services/store-detail.service';
 import { StoreListingService } from '@/features/store/services/store-listing.service';
 import { StoreWishlistService } from '@/features/store/services/store-wishlist.service';
 
@@ -13,8 +15,10 @@ import { StoreWishlistService } from '@/features/store/services/store-wishlist.s
     StoreWishlistRepository,
     StoreListingService,
     StoreWishlistService,
+    StoreDetailService,
     StoreQueryResolver,
     StoreWishlistMutationResolver,
+    StoreDetailQueryResolver,
   ],
   exports: [StoreRepository],
 })
diff --git a/src/features/store/types/store-detail-output.type.ts b/src/features/store/types/store-detail-output.type.ts
new file mode 100644
index 0000000..29cdc36
--- /dev/null
+++ b/src/features/store/types/store-detail-output.type.ts
@@ -0,0 +1,23 @@
+/**
+ * storeDetail resolver 반환용 도메인 출력 타입.
+ * SDL(store-detail.graphql)의 StoreDetail 와 필드 일치.
+ */
+
+export interface StoreDetail {
+  id: string;
+  storeName: string;
+  regionLabel: string | null;
+  ratingAverage: number;
+  reviewCount: number;
+  isWishlisted: boolean;
+  images: string[];
+  phoneNumber: string;
+  addressFull: string;
+  latitude: number | null;
+  longitude: number | null;
+  mapProvider: 'NAVER' | 'KAKAO' | 'NONE';
+  businessHoursText: string | null;
+  regularClosureText: string | null;
+  accessGuideText: string | null;
+  websiteUrl: string | null;
+}
diff --git a/src/test/factories/store.factory.ts b/src/test/factories/store.factory.ts
index bf6574d..952a777 100644
--- a/src/test/factories/store.factory.ts
+++ b/src/test/factories/store.factory.ts
@@ -13,6 +13,12 @@ export interface StoreOverrides {
   address_neighborhood?: string | null;
   region_id?: bigint | null;
   is_active?: boolean;
+  latitude?: number | null;
+  longitude?: number | null;
+  map_provider?: 'NAVER' | 'KAKAO' | 'NONE';
+  business_hours_text?: string | null;
+  access_guide_text?: string | null;
+  regular_closure_text?: string | null;
 }
 
 export async function createStore(
@@ -36,6 +42,12 @@ export async function createStore(
       address_neighborhood: overrides.address_neighborhood ?? '테스트동',
       region_id: overrides.region_id ?? null,
       is_active: overrides.is_active ?? true,
+      latitude: overrides.latitude ?? null,
+      longitude: overrides.longitude ?? null,
+      map_provider: overrides.map_provider ?? 'NONE',
+      business_hours_text: overrides.business_hours_text ?? null,
+      access_guide_text: overrides.access_guide_text ?? null,
+      regular_closure_text: overrides.regular_closure_text ?? null,
     },
   });
 }