diff --git a/src/main/java/com/goormthon3/team49/domain/user/application/UserLoginService.java b/src/main/java/com/goormthon3/team49/domain/user/application/UserLoginService.java
index f3f2186..945c5e4 100644
--- a/src/main/java/com/goormthon3/team49/domain/user/application/UserLoginService.java
+++ b/src/main/java/com/goormthon3/team49/domain/user/application/UserLoginService.java
@@ -105,4 +105,11 @@ public User saveOrUpdateUser(UserInfoResponseDto userInfo) {
         return userRepository.save(user);
     }
 
+    public Long getKakaoUserIdFromAccessToken(String accessToken) {
+
+        UserInfoResponseDto userInfo = getUserInfo(accessToken);
+        Long kakaoUserId = userInfo.getId();
+
+        return kakaoUserId;
+    }
 }
diff --git a/src/main/java/com/goormthon3/team49/domain/user/presentation/UserLoginController.java b/src/main/java/com/goormthon3/team49/domain/user/presentation/UserLoginController.java
index ec91f7c..7b85a4c 100644
--- a/src/main/java/com/goormthon3/team49/domain/user/presentation/UserLoginController.java
+++ b/src/main/java/com/goormthon3/team49/domain/user/presentation/UserLoginController.java
@@ -78,4 +78,18 @@ public ResponseEntity<?> saveUserInfo(@RequestHeader("Authorization") String aut
 
         return ResponseEntity.ok(response);
     }
+
+    @GetMapping("/kakao-user-id")
+    public ResponseEntity<?> getKakaoUserId(@RequestHeader("Authorization") String authorization) {
+
+        if (authorization == null || !authorization.startsWith("Bearer ")) {
+            return new ResponseEntity<>("Missing or invalid Authorization header", HttpStatus.UNAUTHORIZED);
+        }
+
+        String accessToken = authorization.substring(7);
+        Long kakaoUserId = userLoginService.getKakaoUserIdFromAccessToken(accessToken);
+
+        return ResponseEntity.ok(Map.of("kakao_user_id", kakaoUserId));
+    }
+
 }