diff --git a/.changeset/make-http-exception-2.md b/.changeset/make-http-exception-2.md
new file mode 100644
index 00000000..e949c929
--- /dev/null
+++ b/.changeset/make-http-exception-2.md
@@ -0,0 +1,5 @@
+---
+'@hono/firebase-auth': patch
+---
+
+fixed to make HTTPException instead of reponse null for bad request
diff --git a/packages/firebase-auth/src/index.ts b/packages/firebase-auth/src/index.ts
index c4b56503..04e9c2bd 100644
--- a/packages/firebase-auth/src/index.ts
+++ b/packages/firebase-auth/src/index.ts
@@ -39,9 +39,10 @@ export const verifyFirebaseAuth = (userConfig: VerifyFirebaseAuthConfig): Middle
   return async (c, next) => {
     const authorization = c.req.headers.get(config.AuthorizationHeaderKey)
     if (authorization === null) {
-      return new Response(null, {
+      const res = new Response('Bad Request', {
         status: 400,
       })
+      throw new HTTPException(400, { res })
     }
     const jwt = authorization.replace(/Bearer\s+/i, '')
     const auth = Auth.getOrInitialize(