diff --git a/src/main/java/com/swyp/picke/global/common/exception/GlobalExceptionHandler.java b/src/main/java/com/swyp/picke/global/common/exception/GlobalExceptionHandler.java
index aab3438..f636a71 100644
--- a/src/main/java/com/swyp/picke/global/common/exception/GlobalExceptionHandler.java
+++ b/src/main/java/com/swyp/picke/global/common/exception/GlobalExceptionHandler.java
@@ -8,6 +8,7 @@
 import org.springframework.security.access.AccessDeniedException; // 추가
 import org.springframework.security.authorization.AuthorizationDeniedException; // 추가
 import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.MissingServletRequestParameterException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
@@ -40,6 +41,7 @@ public ResponseEntity<ApiResponse<Void>> handleValidation(MethodArgumentNotValid
     @ExceptionHandler({
             HttpMessageNotReadableException.class,
             MethodArgumentTypeMismatchException.class,
+            MissingServletRequestParameterException.class,
             ConstraintViolationException.class,
             IllegalArgumentException.class
     })
diff --git a/src/test/java/com/swyp/picke/domain/ad/controller/AdApiIntegrationTest.java b/src/test/java/com/swyp/picke/domain/ad/controller/AdApiIntegrationTest.java
index 7cc7131..63a2723 100644
--- a/src/test/java/com/swyp/picke/domain/ad/controller/AdApiIntegrationTest.java
+++ b/src/test/java/com/swyp/picke/domain/ad/controller/AdApiIntegrationTest.java
@@ -119,6 +119,15 @@ void recordImpressions_accumulatesIntoSameDailyRow() throws Exception {
                 .isEqualTo(2L);
     }
 
+    @Test
+    @DisplayName("필수 파라미터가 빠지면 500이 아니라 400을 준다")
+    void findAds_missingRequiredParamIsBadRequest() throws Exception {
+        // 전역 핸들러가 MissingServletRequestParameterException 을 잡지 못해 500 으로 새던 자리다.
+        // 광고 전용 문제가 아니라 필수 쿼리 파라미터를 쓰는 모든 API 가 같이 영향을 받는다.
+        mockMvc.perform(get("/api/v1/ads"))
+                .andExpect(status().isBadRequest());
+    }
+
     @Test
     @DisplayName("노출 집계는 한 번에 밀어 넣을 수 있는 소재 수를 제한한다")
     void recordImpressions_rejectsOversizedBatch() throws Exception {