diff --git a/frontend/messages/en.json b/frontend/messages/en.json
index 9c5ca3b..34849dc 100644
--- a/frontend/messages/en.json
+++ b/frontend/messages/en.json
@@ -34,6 +34,7 @@
     "signin": "Sign in",
     "or_signup": "You need sign up?",
     "or_signin": "You need sign in?",
+    "signin_as_guest": "Or sign in as Guest",
     "email": "Email",
     "username": "User name",
     "password": "Password",
diff --git a/frontend/messages/ja.json b/frontend/messages/ja.json
index adf0474..9ebf022 100644
--- a/frontend/messages/ja.json
+++ b/frontend/messages/ja.json
@@ -34,6 +34,7 @@
     "signin": "サインイン",
     "or_signup": "新規登録ページ",
     "or_signin": "サインインページ",
+    "signin_as_guest": "ゲストとしてサインイン",
     "email": "メールアドレス",
     "username": "ユーザー名",
     "password": "パスワード",
diff --git a/frontend/src/app/[locale]/TokenProvider.tsx b/frontend/src/app/[locale]/TokenProvider.tsx
index 25ce3c9..fce7ca4 100644
--- a/frontend/src/app/[locale]/TokenProvider.tsx
+++ b/frontend/src/app/[locale]/TokenProvider.tsx
@@ -5,7 +5,7 @@ import { TokenProps } from '@/types/user';
 import { useRouter, usePathname } from '@/src/navigation';
 
 const LOCAL_STORAGE_KEY = 'testplat-auth-token';
-const privatePaths = ['/account'];
+const privatePaths = ['/account', '/projects'];
 
 function storeTokenToLocalStorage(token: TokenType) {
   localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(token));
@@ -31,6 +31,7 @@ const TokenProvider = ({ locale, children }: TokenProps) => {
   const router = useRouter();
   const pathname = usePathname();
 
+  const [hasRestoreFinished, setHasRestoreFinished] = useState(false);
   const [token, setToken] = useState<TokenType>({
     access_token: '',
     user: null,
@@ -53,25 +54,33 @@ const TokenProvider = ({ locale, children }: TokenProps) => {
     if (tokenString) {
       const restoredToken = JSON.parse(tokenString);
       setToken(restoredToken);
-    } else {
-      checkSignInPage();
-    }
-  };
-
-  const checkSignInPage = () => {
-    if (
-      privatePaths.some((path) => {
-        return path === pathname;
-      })
-    ) {
-      router.push(`/account/signin`, { locale: locale });
     }
+    setHasRestoreFinished(true);
   };
 
   useEffect(() => {
     restoreTokenFromLocalStorage();
   }, []);
 
+  useEffect(() => {
+    const isPrivatePath = () => {
+      return privatePaths.some((path) => {
+        return path === pathname;
+      });
+    };
+
+    const checkSignInPage = () => {
+      if (!hasRestoreFinished) {
+        return;
+      }
+      if (isPrivatePath() && !isSignedIn()) {
+        router.push(`/account/signin`, { locale: locale });
+      }
+    };
+
+    checkSignInPage();
+  }, [pathname, hasRestoreFinished]);
+
   return <TokenContext.Provider value={tokenContext}>{children}</TokenContext.Provider>;
 };
 
diff --git a/frontend/src/app/[locale]/account/authControl.ts b/frontend/src/app/[locale]/account/authControl.ts
index 01392c9..2742cd8 100644
--- a/frontend/src/app/[locale]/account/authControl.ts
+++ b/frontend/src/app/[locale]/account/authControl.ts
@@ -1,5 +1,6 @@
 import { UserType } from '@/types/user';
 import Config from '@/config/config';
+import { roles } from '@/config/selection';
 const apiServer = Config.apiServer;
 
 async function signUp(newUser: UserType) {
@@ -50,9 +51,35 @@ async function signIn(signInUser: UserType) {
   }
 }
 
+async function signInAsGuest() {
+  const guestUser = {
+    id: null,
+    email: generateRandomEmail(),
+    password: 'guestpassword',
+    username: 'Guest',
+    role: roles.findIndex((entry) => entry.uid === 'user'),
+    avatarPath: '',
+  };
+  const token = await signUp(guestUser);
+  return token;
+}
+
+function generateRandomEmail() {
+  const randomStringLength = 10;
+  const characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+  let randomString = '';
+  const charactersLength = characters.length;
+
+  for (let i = 0; i < randomStringLength; i++) {
+    randomString += characters.charAt(Math.floor(Math.random() * charactersLength));
+  }
+
+  return `${randomString}@example.com`;
+}
+
 function getRandomAvatarPath() {
   const randomIndex = Math.floor(Math.random() * avatars.length);
   return avatars[randomIndex];
 }
 
-export { signUp, signIn, getRandomAvatarPath };
+export { signUp, signIn, signInAsGuest, getRandomAvatarPath };
diff --git a/frontend/src/app/[locale]/account/authPage.tsx b/frontend/src/app/[locale]/account/authPage.tsx
index bad45b7..a6db86e 100644
--- a/frontend/src/app/[locale]/account/authPage.tsx
+++ b/frontend/src/app/[locale]/account/authPage.tsx
@@ -6,7 +6,7 @@ import { Link } from '@/src/navigation';
 import { ChevronRight, Eye, EyeOff } from 'lucide-react';
 import { UserType, AuthMessages } from '@/types/user';
 import { roles } from '@/config/selection';
-import { signUp, signIn } from './authControl';
+import { signUp, signIn, signInAsGuest } from './authControl';
 import { isValidEmail, isValidPassword } from './validate';
 import { TokenContext } from '../TokenProvider';
 import { useRouter } from '@/src/navigation';
@@ -83,6 +83,13 @@ export default function AuthPage({ isSignup, messages, locale }: Props) {
     router.push('/account', { locale: locale });
   };
 
+  const handleSignInAsGuest = async () => {
+    const token = await signInAsGuest();
+    context.setToken(token);
+    context.storeTokenToLocalStorage(token);
+    router.push('/account', { locale: locale });
+  };
+
   return (
     <Card className="w-[480px] mt-16">
       <CardHeader className="px-4 pt-4 pb-0 flex justify-between">
@@ -159,10 +166,18 @@ export default function AuthPage({ isSignup, messages, locale }: Props) {
               }}
             />
           )}
-          <div className="flex justify-end">
-            <Button color="primary" className="mt-3" onPress={validate}>
+          <div className="flex justify-end items-center mt-3">
+            <Button color="primary" onPress={validate}>
               {messages.submitTitle}
             </Button>
+            {!isSignup && (
+              <Button
+                className="ms-3 bg-gradient-to-tr from-pink-500 to-yellow-500 text-white shadow-lg"
+                onPress={handleSignInAsGuest}
+              >
+                {messages.signInAsGuest}
+              </Button>
+            )}
           </div>
         </form>
       </CardBody>
diff --git a/frontend/src/app/[locale]/account/signin/page.tsx b/frontend/src/app/[locale]/account/signin/page.tsx
index a516d2e..863df8f 100644
--- a/frontend/src/app/[locale]/account/signin/page.tsx
+++ b/frontend/src/app/[locale]/account/signin/page.tsx
@@ -7,6 +7,7 @@ export default function Page(params: { locale: string }) {
     title: t('signin'),
     linkTitle: t('or_signup'),
     submitTitle: t('signin'),
+    signInAsGuest: t('signin_as_guest'),
     email: t('email'),
     username: t('username'),
     password: t('password'),
diff --git a/frontend/src/app/[locale]/projects/NeedSignedInDialog.tsx b/frontend/src/app/[locale]/projects/NeedSignedInDialog.tsx
deleted file mode 100644
index 91ebb07..0000000
--- a/frontend/src/app/[locale]/projects/NeedSignedInDialog.tsx
+++ /dev/null
@@ -1,31 +0,0 @@
-'use client';
-import { ProjectsMessages } from '@/types/project';
-import { Link } from '@/src/navigation';
-import { Button, Modal, ModalContent, ModalHeader, ModalFooter } from '@nextui-org/react';
-
-type Props = {
-  isOpen: boolean;
-  onCancel: () => void;
-  messages: ProjectsMessages;
-  locale: string;
-};
-
-export default function NeedSignedInDialog({ isOpen, onCancel, messages, locale }: Props) {
-  return (
-    <Modal
-      isOpen={isOpen}
-      onOpenChange={() => {
-        onCancel();
-      }}
-    >
-      <ModalContent>
-        <ModalHeader className="flex flex-col gap-1">{messages.needSignedIn}</ModalHeader>
-        <ModalFooter>
-          <Link href={'/account/signin'} locale={locale}>
-            <Button color="primary">{messages.signIn}</Button>
-          </Link>
-        </ModalFooter>
-      </ModalContent>
-    </Modal>
-  );
-}
diff --git a/frontend/src/app/[locale]/projects/ProjectsPage.tsx b/frontend/src/app/[locale]/projects/ProjectsPage.tsx
index 2a24871..3323136 100644
--- a/frontend/src/app/[locale]/projects/ProjectsPage.tsx
+++ b/frontend/src/app/[locale]/projects/ProjectsPage.tsx
@@ -6,7 +6,6 @@ import { TokenContext } from '@/src/app/[locale]/TokenProvider';
 import { ProjectType, ProjectsMessages } from '@/types/project';
 import ProjectsTable from './ProjectsTable';
 import ProjectDialog from './ProjectDialog';
-import NeedSignedInDialog from './NeedSignedInDialog';
 import { fetchProjects, createProject, updateProject, deleteProject } from './projectsControl';
 
 export type Props = {
@@ -35,15 +34,9 @@ export default function ProjectsPage({ messages, locale }: Props) {
   }, [context]);
 
   // dialog
-  const [isNeedSignedInDialogOpen, setIsNeedSignedInDialogOpen] = useState(false);
   const [isProjectDialogOpen, setIsProjectDialogOpen] = useState(false);
   const [editingProject, setEditingProject] = useState<ProjectType | null>(null);
   const openDialogForCreate = () => {
-    if (!context.isSignedIn()) {
-      setIsNeedSignedInDialogOpen(true);
-      return;
-    }
-
     setIsProjectDialogOpen(true);
     setEditingProject(null);
   };
@@ -105,13 +98,6 @@ export default function ProjectsPage({ messages, locale }: Props) {
         onSubmit={onSubmit}
         messages={messages}
       />
-
-      <NeedSignedInDialog
-        isOpen={isNeedSignedInDialogOpen}
-        onCancel={() => setIsNeedSignedInDialogOpen(false)}
-        messages={messages}
-        locale={locale}
-      />
     </div>
   );
 }
diff --git a/frontend/types/user.ts b/frontend/types/user.ts
index 067fd16..10bcc98 100644
--- a/frontend/types/user.ts
+++ b/frontend/types/user.ts
@@ -32,6 +32,7 @@ export type AuthMessages = {
   title: string;
   linkTitle: string;
   submitTitle: string;
+  signInAsGuest: string;
   email: string;
   username: string;
   password: string;