diff --git a/src/main/java/EatPic/spring/domain/user/controller/UserController.java b/src/main/java/EatPic/spring/domain/user/controller/UserController.java
index 166cbd0..c17202b 100644
--- a/src/main/java/EatPic/spring/domain/user/controller/UserController.java
+++ b/src/main/java/EatPic/spring/domain/user/controller/UserController.java
@@ -54,5 +54,12 @@ public ResponseEntity<Map<String, Boolean>> checkEmail(@RequestParam String emai
         boolean isDuplicate = userService.isEmailDuplicate(email);
         return ResponseEntity.ok(Map.of("isDuplicate", isDuplicate));
     }
-}
 
+    // 유저 아이디 중복 검사
+    @GetMapping("/check-user-id")
+    @Operation(summary = "유저 아이디 중복 검사")
+    public ResponseEntity<Map<String, Boolean>> checkUserId(@RequestParam String nameId) {
+        boolean isDuplicate = userService.isnameIdDuplicate(nameId);
+        return ResponseEntity.ok(Map.of("isDuplicate", isDuplicate));
+    }
+}
diff --git a/src/main/java/EatPic/spring/domain/user/service/UserService.java b/src/main/java/EatPic/spring/domain/user/service/UserService.java
index afb25ea..64b1a05 100644
--- a/src/main/java/EatPic/spring/domain/user/service/UserService.java
+++ b/src/main/java/EatPic/spring/domain/user/service/UserService.java
@@ -16,6 +16,7 @@ public interface UserService {
     UserResponseDTO.ProfileDto getMyIcon();
     UserResponseDTO.UserBlockResponseDto blockUser(Long targetUserId);
     boolean isEmailDuplicate(String email);
+    boolean isnameIdDuplicate(String nameId);
 
     // UserQueryService
     UserInfoDTO getUserInfo(HttpServletRequest request);
diff --git a/src/main/java/EatPic/spring/domain/user/service/UserServiceImpl.java b/src/main/java/EatPic/spring/domain/user/service/UserServiceImpl.java
index 9d27574..810e557 100644
--- a/src/main/java/EatPic/spring/domain/user/service/UserServiceImpl.java
+++ b/src/main/java/EatPic/spring/domain/user/service/UserServiceImpl.java
@@ -166,4 +166,9 @@ public UserResponseDTO.UserBlockResponseDto blockUser(Long targetUserId) {
     public boolean isEmailDuplicate(String email){
         return userRepository.existsByEmail(email);
     }
+
+    // 유저 아이디 중복 검사
+    public boolean isnameIdDuplicate(String nameId){
+        return userRepository.existsByNameId(nameId);
+    }
 }
\ No newline at end of file