diff --git a/packages/backend/src/server/api/index.ts b/packages/backend/src/server/api/index.ts
index bfbc6a3fef..fc6e0158d8 100644
--- a/packages/backend/src/server/api/index.ts
+++ b/packages/backend/src/server/api/index.ts
@@ -40,14 +40,7 @@ app.use(async (ctx, next) => {
 app.use(formidable());
 
 app.use(
-	bodyParser({
-		// リクエストが multipart/form-data でない限りはJSONだと見なす
-		detectJSON: (ctx) =>
-			!(
-				ctx.is("multipart/form-data") ||
-				ctx.is("application/x-www-form-urlencoded")
-			),
-	}),
+	bodyParser(),
 );
 
 // Init multer instance