diff --git a/devslab-kit-menu-core/src/main/java/kr/devslab/kit/menu/core/repository/JpaPlatformMenuRepository.java b/devslab-kit-menu-core/src/main/java/kr/devslab/kit/menu/core/repository/JpaPlatformMenuRepository.java
index 9ab4628..7693de9 100644
--- a/devslab-kit-menu-core/src/main/java/kr/devslab/kit/menu/core/repository/JpaPlatformMenuRepository.java
+++ b/devslab-kit-menu-core/src/main/java/kr/devslab/kit/menu/core/repository/JpaPlatformMenuRepository.java
@@ -1,6 +1,7 @@
 package kr.devslab.kit.menu.core.repository;
 
 import java.util.List;
+import java.util.Optional;
 import java.util.UUID;
 import kr.devslab.kit.menu.core.entity.PlatformMenuEntity;
 import org.springframework.data.jpa.repository.JpaRepository;
@@ -8,4 +9,6 @@
 public interface JpaPlatformMenuRepository extends JpaRepository<PlatformMenuEntity, UUID> {
 
     List<PlatformMenuEntity> findAllByTenantIdOrderBySortOrderAsc(String tenantId);
+
+    Optional<PlatformMenuEntity> findByTenantIdAndCode(String tenantId, String code);
 }
diff --git a/devslab-kit-menu-core/src/main/java/kr/devslab/kit/menu/core/service/MenuAdminService.java b/devslab-kit-menu-core/src/main/java/kr/devslab/kit/menu/core/service/MenuAdminService.java
index 0a711d0..55b3220 100644
--- a/devslab-kit-menu-core/src/main/java/kr/devslab/kit/menu/core/service/MenuAdminService.java
+++ b/devslab-kit-menu-core/src/main/java/kr/devslab/kit/menu/core/service/MenuAdminService.java
@@ -31,6 +31,9 @@ public PlatformMenuEntity create(
             String requiredPermissionCode,
             String icon
     ) {
+        if (repository.findByTenantIdAndCode(tenantId.value(), code).isPresent()) {
+            throw new IllegalStateException("Menu already exists: tenant=" + tenantId + " code=" + code);
+        }
         PlatformMenuEntity entity = new PlatformMenuEntity(
                 UUID.randomUUID(),
                 tenantId.value(),