diff --git a/CHANGELOG.md b/CHANGELOG.md
index da204c9198..ad070cc981 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@
 -
 
 ### Server
--
+- ファイルがサイズの制限を超えてアップロードされた際にエラーを返さなかった問題を修正
 
 
 ## 2024.8.0
diff --git a/packages/backend/src/server/api/ApiCallService.ts b/packages/backend/src/server/api/ApiCallService.ts
index 47f64f6609..ea852d590d 100644
--- a/packages/backend/src/server/api/ApiCallService.ts
+++ b/packages/backend/src/server/api/ApiCallService.ts
@@ -199,9 +199,17 @@ export class ApiCallService implements OnApplicationShutdown {
 			return;
 		}
 
-		const [path] = await createTemp();
+		const [path, cleanup] = await createTemp();
 		await stream.pipeline(multipartData.file, fs.createWriteStream(path));
 
+		// ファイルサイズが制限を超えていた場合
+		if (multipartData.file.truncated) {
+			cleanup();
+			reply.code(413);
+			reply.send();
+			return;
+		}
+
 		const fields = {} as Record<string, unknown>;
 		for (const [k, v] of Object.entries(multipartData.fields)) {
 			fields[k] = typeof v === 'object' && 'value' in v ? v.value : undefined;