diff --git a/src/main/java/clap/server/adapter/inbound/web/admin/addCategoryController.java b/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
similarity index 59%
rename from src/main/java/clap/server/adapter/inbound/web/admin/addCategoryController.java
rename to src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
index bcf5bec7..36a8a6f4 100644
--- a/src/main/java/clap/server/adapter/inbound/web/admin/addCategoryController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
@@ -1,36 +1,39 @@
 package clap.server.adapter.inbound.web.admin;
 
 import clap.server.adapter.inbound.security.SecurityUserDetails;
+import clap.server.adapter.inbound.web.dto.AddSubCategoryRequest;
 import clap.server.adapter.inbound.web.dto.admin.AddMainCategoryRequest;
 import clap.server.application.port.inbound.management.AddMainCategoryUsecase;
+import clap.server.application.port.inbound.management.AddSubCategoryUsecase;
 import clap.server.common.annotation.architecture.WebAdapter;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.security.access.annotation.Secured;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
-import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 
 @Tag(name = "카테고리 추가")
 @WebAdapter
 @RequiredArgsConstructor
-public class addCategoryController {
+public class AddCategoryController {
     private final AddMainCategoryUsecase addMainCategoryUsecase;
+    private final AddSubCategoryUsecase addSubCategoryUsecase;
 
     @Operation(summary = "1차 카테고리 추가")
     @PostMapping("/api/maincategory")
     @Secured("ROLE_ADMIN")
-    public void addMainCategory(@AuthenticationPrincipal SecurityUserDetails userInfo, @Validated @RequestBody AddMainCategoryRequest addMainCategoryRequest) {
+    public void addMainCategory(@AuthenticationPrincipal SecurityUserDetails userInfo, @Valid @RequestBody AddMainCategoryRequest addMainCategoryRequest) {
         addMainCategoryUsecase.addMainCategory(userInfo.getUserId(), addMainCategoryRequest.code(), addMainCategoryRequest.name());
     }
 
-//    @Operation(summary = "2차 카테고리 추가")
-//    @PostMapping("/api/subcategory")
-//    @Secured("ROLE_ADMIN")
-//    public void addSubCategory(@Validated @RequestBody AddCategoryRequest addCategoryRequest) {
-//        addMainCategoryUsecase.addSubCategory(addCategoryRequest.code(), addCategoryRequest.name());
-//    }
+    @Operation(summary = "2차 카테고리 추가")
+    @PostMapping("/api/subcategory")
+    @Secured("ROLE_ADMIN")
+    public void addSubCategory(@AuthenticationPrincipal SecurityUserDetails userInfo, @Valid @RequestBody AddSubCategoryRequest addCategoryRequest) {
+        addSubCategoryUsecase.addSubCategory(userInfo.getUserId(), addCategoryRequest.mainCategoryId(), addCategoryRequest.code(), addCategoryRequest.name());
+    }
 
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/adapter/inbound/web/dto/AddSubCategoryRequest.java b/src/main/java/clap/server/adapter/inbound/web/dto/AddSubCategoryRequest.java
new file mode 100644
index 00000000..e5dab089
--- /dev/null
+++ b/src/main/java/clap/server/adapter/inbound/web/dto/AddSubCategoryRequest.java
@@ -0,0 +1,15 @@
+package clap.server.adapter.inbound.web.dto;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import org.hibernate.validator.constraints.Length;
+
+public record AddSubCategoryRequest(
+        @Min(1)
+        Long mainCategoryId,
+        @NotBlank @Length(max = 20)
+        String name,
+        @NotBlank @Pattern(regexp = "^[A-Z]{1,2}$", message = "올바른 카테고리 코드 형식이 아닙니다.")
+        String code) {
+}
diff --git a/src/main/java/clap/server/application/port/inbound/management/AddSubCategoryUsecase.java b/src/main/java/clap/server/application/port/inbound/management/AddSubCategoryUsecase.java
new file mode 100644
index 00000000..314d04ad
--- /dev/null
+++ b/src/main/java/clap/server/application/port/inbound/management/AddSubCategoryUsecase.java
@@ -0,0 +1,6 @@
+package clap.server.application.port.inbound.management;
+
+
+public interface AddSubCategoryUsecase {
+    void addSubCategory(Long adminId, Long mainCategoryId, String code, String name);
+}
diff --git a/src/main/java/clap/server/application/service/admin/AddSubCategoryService.java b/src/main/java/clap/server/application/service/admin/AddSubCategoryService.java
new file mode 100644
index 00000000..0b6dfdd0
--- /dev/null
+++ b/src/main/java/clap/server/application/service/admin/AddSubCategoryService.java
@@ -0,0 +1,36 @@
+package clap.server.application.service.admin;
+
+import clap.server.application.port.inbound.management.AddSubCategoryUsecase;
+import clap.server.application.port.outbound.member.LoadMemberPort;
+import clap.server.application.port.outbound.task.CommandCategoryPort;
+import clap.server.application.port.outbound.task.LoadCategoryPort;
+import clap.server.common.annotation.architecture.ApplicationService;
+import clap.server.domain.model.member.Member;
+import clap.server.domain.model.task.Category;
+import clap.server.exception.ApplicationException;
+import lombok.RequiredArgsConstructor;
+
+import java.util.Optional;
+
+import static clap.server.exception.code.MemberErrorCode.ACTIVE_MEMBER_NOT_FOUND;
+import static clap.server.exception.code.TaskErrorCode.CATEGORY_NOT_FOUND;
+
+@ApplicationService
+@RequiredArgsConstructor
+public class AddSubCategoryService implements AddSubCategoryUsecase {
+    private final CommandCategoryPort commandCategoryPort;
+    private final LoadMemberPort loadMemberPort;
+    private final LoadCategoryPort loadCategoryPort;
+
+    @Override
+    public void addSubCategory(Long adminId, Long mainCategoryId, String code, String name) {
+        Optional<Member> activeMember = loadMemberPort.findActiveMemberById(adminId);
+        Optional<Category> mainCategory = loadCategoryPort.findById(mainCategoryId);
+
+        Category subCategory = Category.createSubCategory(
+                activeMember.orElseThrow(() -> new ApplicationException(ACTIVE_MEMBER_NOT_FOUND)),
+                mainCategory.orElseThrow(() -> new ApplicationException(CATEGORY_NOT_FOUND)),
+                code, name);
+        commandCategoryPort.save(subCategory);
+    }
+}
diff --git a/src/main/java/clap/server/domain/model/task/Category.java b/src/main/java/clap/server/domain/model/task/Category.java
index 36a87207..6cc479de 100644
--- a/src/main/java/clap/server/domain/model/task/Category.java
+++ b/src/main/java/clap/server/domain/model/task/Category.java
@@ -24,11 +24,20 @@ public class Category extends BaseTime {
    private LocalDateTime updatedAt;
 
    public static Category createMainCategory(Member admin, String code, String name) {
-      Category category = new Category();
-      category.admin = admin;
-      category.code = code;
-      category.name = name;
-      return category;
+      return Category.builder()
+              .admin(admin)
+              .code(code)
+              .name(name)
+              .build();
+   }
+
+   public static Category createSubCategory(Member admin, Category mainCategory, String code, String name) {
+      return Category.builder()
+              .mainCategory(mainCategory)
+              .admin(admin)
+              .code(code)
+              .name(name)
+              .build();
    }
  }
 
diff --git a/src/test/java/clap/server/application/service/admin/AddCategoryServiceTest.java b/src/test/java/clap/server/application/service/admin/AddCategoryServiceTest.java
new file mode 100644
index 00000000..b35c58fb
--- /dev/null
+++ b/src/test/java/clap/server/application/service/admin/AddCategoryServiceTest.java
@@ -0,0 +1,82 @@
+package clap.server.application.service.admin;
+
+import clap.server.adapter.outbound.persistense.entity.member.MemberEntity;
+import clap.server.adapter.outbound.persistense.entity.member.constant.MemberRole;
+import clap.server.adapter.outbound.persistense.entity.member.constant.MemberStatus;
+import clap.server.adapter.outbound.persistense.entity.task.CategoryEntity;
+import jakarta.persistence.EntityManager;
+import jakarta.transaction.Transactional;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.annotation.Rollback;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+import org.testcontainers.elasticsearch.ElasticsearchContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest
+@Testcontainers
+@Transactional
+class AddCategoryServiceTest {
+
+    @Container
+    public static ElasticsearchContainer ES_CONTAINER = new ElasticsearchContainer("docker.elastic.co/elasticsearch/elasticsearch:7.17.5")
+            .withReuse(true);
+
+    @DynamicPropertySource
+    static void elasticProperties(DynamicPropertyRegistry registry) {
+        // Elasticsearch 설정
+        registry.add("spring.elasticsearch.uris", ES_CONTAINER::getHttpHostAddress);
+    }
+
+    @Autowired
+    private AddMainCategoryService addMainCategoryService;
+    @Autowired
+    private AddSubCategoryService addsubCategoryService;
+    @Autowired
+    private EntityManager entityManager;
+
+    @Test
+    @Transactional
+    @Rollback(false)
+    void addMainCategory() {
+        // 관리자 추가
+        MemberEntity admin = MemberEntity.builder()
+                .name("Admin")
+                .email("admin@example.com")
+                .nickname("admin.ad")
+                .isReviewer(false)
+                .role(MemberRole.ROLE_ADMIN)
+                .departmentRole("Admin")
+                .status(MemberStatus.ACTIVE)
+                .password("admin123")
+                .build();
+        entityManager.persist(admin);
+
+        admin = entityManager.find(MemberEntity.class, 1);
+        addMainCategoryService.addMainCategory(admin.getMemberId(), "VM", "가상머신");
+
+        CategoryEntity category = entityManager.find(CategoryEntity.class, 1);
+        assertThat(category.getCategoryId()).isEqualTo(1);
+        assertThat(category.getName()).isEqualTo("가상머신");
+        assertThat(category.getCode()).isEqualTo("VM");
+        assertThat(category.getAdmin().getMemberId()).isEqualTo(1);
+    }
+
+    @Test
+    void addSubCategory() {
+        MemberEntity admin = entityManager.find(MemberEntity.class, 1);
+        addsubCategoryService.addSubCategory(admin.getMemberId(), 1L, "CR", "생성");
+
+        CategoryEntity category = entityManager.find(CategoryEntity.class, 2);
+        assertThat(category.getCategoryId()).isEqualTo(2);
+        assertThat(category.getMainCategory().getCategoryId()).isEqualTo(1);
+        assertThat(category.getName()).isEqualTo("생성");
+        assertThat(category.getCode()).isEqualTo("CR");
+        assertThat(category.getAdmin().getMemberId()).isEqualTo(1);
+    }
+}
\ No newline at end of file