diff --git a/task_yell/.gitignore b/task_yell/.gitignore
index fd3dbb5..f696615 100644
--- a/task_yell/.gitignore
+++ b/task_yell/.gitignore
@@ -34,3 +34,5 @@ yarn-error.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+certificates
\ No newline at end of file
diff --git a/task_yell/package.json b/task_yell/package.json
index 0843702..66c9299 100644
--- a/task_yell/package.json
+++ b/task_yell/package.json
@@ -4,6 +4,7 @@
   "private": true,
   "scripts": {
     "dev": "next dev",
+    "dev-https": "next dev --experimental-https",
     "build": "next build",
     "start": "next start",
     "lint": "next lint"
diff --git a/task_yell/src/components/sign-in-button.tsx b/task_yell/src/components/sign-in-button.tsx
new file mode 100644
index 0000000..ae274a7
--- /dev/null
+++ b/task_yell/src/components/sign-in-button.tsx
@@ -0,0 +1,69 @@
+"use client";
+
+import { onAuthStateChanged } from "@/firebase/auth";
+import { auth } from "@/firebase/client-app";
+import { GoogleAuthProvider, signInWithPopup, type User } from "firebase/auth";
+import { useRouter } from "next/navigation";
+import { useCallback, useEffect, useState } from "react";
+
+function useUserSession() {
+  // The initialUser comes from the server via a server component
+  const [user, setUser] = useState<User | null>();
+  const router = useRouter();
+
+  // Register the service worker that sends auth state back to server
+  // The service worker is built with npm run build-service-worker
+  // useEffect(() => {
+  //   if ("serviceWorker" in navigator) {
+  //     const serializedFirebaseConfig = encodeURIComponent(JSON.stringify(firebaseConfig));
+  //     const serviceWorkerUrl = `/auth-service-worker.js?firebaseConfig=${serializedFirebaseConfig}`
+
+  //     navigator.serviceWorker
+  //       .register(serviceWorkerUrl)
+  //       .then((registration) => console.log("scope is: ", registration.scope));
+  //   }
+  // }, []);
+
+  useEffect(() => {
+    const unsubscribe = onAuthStateChanged((authUser) => {
+      setUser(authUser)
+    })
+
+    return () => unsubscribe()
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  useEffect(() => {
+    onAuthStateChanged((authUser) => {
+      if (user === undefined) return
+
+      // refresh when user changed to ease testing
+      if (user?.email !== authUser?.email) {
+        router.refresh()
+      }
+    })
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [user, router.refresh])
+
+  return user;
+}
+
+export function SignInButton() {
+  const user = useUserSession();
+  const handleSignIn = useCallback(async () => {
+    const provider = new GoogleAuthProvider();
+    await signInWithPopup(auth, provider);
+  }, []);
+  const handleSignOut = useCallback(async () => {
+    console.log("signing out")
+    await auth.signOut();
+  }, []);
+
+  return !user ?
+    (<button type="button" onClick={handleSignIn} >
+      サインイン
+    </button>) : (<button type="button" onClick={handleSignOut}>
+      サインアウト
+    </button>
+    )
+}
\ No newline at end of file
diff --git a/task_yell/src/firebase/auth.ts b/task_yell/src/firebase/auth.ts
new file mode 100644
index 0000000..e767709
--- /dev/null
+++ b/task_yell/src/firebase/auth.ts
@@ -0,0 +1,31 @@
+import {
+  GoogleAuthProvider,
+  signInWithPopup,
+  onAuthStateChanged as _onAuthStateChanged,
+} from "firebase/auth";
+
+import { auth } from "@/firebase/client-app";
+
+export type NextOrObserveUser = Parameters<typeof _onAuthStateChanged>[1];
+
+export function onAuthStateChanged(cb: NextOrObserveUser) {
+  return _onAuthStateChanged(auth, cb);
+}
+
+export async function signInWithGoogle() {
+  const provider = new GoogleAuthProvider();
+
+  try {
+    await signInWithPopup(auth, provider);
+  } catch (error) {
+    console.error("Error signing in with Google", error);
+  }
+}
+
+export async function signOut() {
+  try {
+    return auth.signOut();
+  } catch (error) {
+    console.error("Error signing out with Google", error);
+  }
+}
\ No newline at end of file