diff --git a/src/pages/common/Page404.tsx b/src/pages/common/Page404.tsx
index d87104d..4c1bf0e 100644
--- a/src/pages/common/Page404.tsx
+++ b/src/pages/common/Page404.tsx
@@ -1,5 +1,6 @@
 import { Box } from "@mui/material";
 import { PageID } from "codes/page";
+import useAuth from "hooks/useAuth";
 import useNavigateCustom from "hooks/useNavigateCustom";
 import { useEffect } from "react";
 import { getPath } from "routes/path";
@@ -7,9 +8,15 @@ import { StoreId, getStore } from "storage/localstorage";
 
 export default function Page404() {
   const { navigateWhenChanged } = useNavigateCustom();
+  const { authenticated } = useAuth();
 
   // ログインページにアクセス経験ある場合は、ログインページへ遷移させる
   useEffect(() => {
+    if (authenticated) {
+      navigateWhenChanged(getPath(PageID.DASHBOARD_OVERVIEW));
+      return;
+    }
+
     const canLoginRoute = !!getStore(StoreId.LOGIN_ROUTE);
 
     if (canLoginRoute) {