diff --git a/src/main/java/com/petlog/diary/controller/DiaryController.java b/src/main/java/com/petlog/diary/controller/DiaryController.java
index 34a8f78..7054ee0 100644
--- a/src/main/java/com/petlog/diary/controller/DiaryController.java
+++ b/src/main/java/com/petlog/diary/controller/DiaryController.java
@@ -112,9 +112,12 @@ public ResponseEntity<ApiResponse<Void>> updateDiary(
 
     @DeleteMapping("/{diaryId}")
     public ResponseEntity<ApiResponse<Void>> deleteDiary(
+        @Authenticated final Long memberId,
         @PathVariable final Long groupId,
         @PathVariable final Long diaryId
     ) {
+        diaryService.deleteDiary(memberId, groupId, diaryId);
+
         return ResponseEntity.ok(
             ApiResponse.success(DELETE_DIARY)
         );
diff --git a/src/main/java/com/petlog/diary/service/DiaryService.java b/src/main/java/com/petlog/diary/service/DiaryService.java
index e3028db..4fdba2a 100644
--- a/src/main/java/com/petlog/diary/service/DiaryService.java
+++ b/src/main/java/com/petlog/diary/service/DiaryService.java
@@ -139,4 +139,17 @@ private void validateIsDairyWriter(final Member member, final Diary diary) {
             throw new IllegalArgumentException("일기 작성자만 수정할 수 있습니다.");
         }
     }
+
+    @Transactional
+    public void deleteDiary(final Long memberId, final Long groupId, final Long diaryId) {
+        final Member member = getMember(memberId);
+        final PetGroup petGroup = getPetGroup(groupId);
+        getPetGroupMember(member, petGroup);
+
+        final Diary diary = getDiaryDetail(diaryId);
+        validateIsDairyWriter(member, diary);
+
+        diaryImageRepository.deleteAllByDiary(diary);
+        diaryRepository.deleteById(diaryId);
+    }
 }
diff --git a/src/main/java/com/petlog/docs/DiaryControllerDocs.java b/src/main/java/com/petlog/docs/DiaryControllerDocs.java
index 946b99f..52477d7 100644
--- a/src/main/java/com/petlog/docs/DiaryControllerDocs.java
+++ b/src/main/java/com/petlog/docs/DiaryControllerDocs.java
@@ -15,7 +15,7 @@
 @Tag(name = "일기 API")
 public interface DiaryControllerDocs {
 
-    @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "일기 생성에 성공하였습니다.")
+    @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "201", description = "일기 생성에 성공하였습니다.")
     @Operation(summary = "일기 생성 API")
     ResponseEntity<ApiResponse<Void>> createDiary(@Authenticated final Long memberId, @PathVariable final Long groupId, @RequestBody final CreateDiaryRequestDto request);
 
@@ -33,5 +33,5 @@ public interface DiaryControllerDocs {
 
     @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "일기 삭제가 성공하였습니다.")
     @Operation(summary = "일기 삭제 API")
-    ResponseEntity<ApiResponse<Void>> deleteDiary(@PathVariable final Long groupId, @PathVariable final Long diaryId);
+    ResponseEntity<ApiResponse<Void>> deleteDiary(@Authenticated final Long memberId, @PathVariable final Long groupId, @PathVariable final Long diaryId);
 }