diff --git a/frontend/components/navbar.tsx b/frontend/components/navbar.tsx
deleted file mode 100644
index 00281f4..0000000
--- a/frontend/components/navbar.tsx
+++ /dev/null
@@ -1,98 +0,0 @@
-import {
-  Navbar as NextUINavbar,
-  NavbarContent,
-  NavbarMenuToggle,
-  NavbarBrand,
-  NavbarItem,
-  Kbd,
-  Link as NextUiLink,
-  Input,
-} from "@nextui-org/react";
-import { Link } from "@/src/navigation";
-import { siteConfig } from "@/config/site";
-import { ThemeSwitch } from "@/components/theme-switch";
-import { GithubIcon, SearchIcon } from "@/components/icons";
-
-import Image from "next/image";
-
-export const Navbar = () => {
-  const searchInput = (
-    <Input
-      aria-label="Search"
-      classNames={{
-        inputWrapper: "bg-default-100",
-        input: "text-sm",
-      }}
-      endContent={
-        <Kbd className="hidden lg:inline-block" keys={["command"]}>
-          K
-        </Kbd>
-      }
-      labelPlacement="outside"
-      placeholder="Search..."
-      startContent={
-        <SearchIcon className="text-base text-default-400 pointer-events-none flex-shrink-0" />
-      }
-      type="search"
-    />
-  );
-
-  return (
-    <NextUINavbar maxWidth="xl" position="sticky" className="bg-inherit">
-      <NavbarContent className="basis-1/5 sm:basis-full" justify="start">
-        <NavbarBrand as="li" className="gap-3 max-w-fit">
-          <Link className="flex justify-start items-center gap-1" href="/">
-            <Image
-              src="/favicon/android-chrome-192x192.png"
-              width={32}
-              height={32}
-              alt="Logo"
-            />
-            <p className="font-bold text-inherit">Test Case Manager</p>
-          </Link>
-        </NavbarBrand>
-        <ul className="hidden lg:flex gap-4 justify-start ml-2">
-          {siteConfig.navItems.map((item) => (
-            <NavbarItem key={item.href}>
-              <Link
-                className="data-[active=true]:text-primary data-[active=true]:font-medium"
-                href={item.href}
-              >
-                {item.label}
-              </Link>
-            </NavbarItem>
-          ))}
-        </ul>
-      </NavbarContent>
-
-      <NavbarContent
-        className="hidden sm:flex basis-1/5 sm:basis-full"
-        justify="end"
-      >
-        <NavbarItem className="hidden sm:flex gap-2">
-          <NextUiLink
-            isExternal
-            href={siteConfig.links.github}
-            aria-label="Github"
-          >
-            <GithubIcon className="text-default-500" />
-          </NextUiLink>
-          <ThemeSwitch />
-        </NavbarItem>
-        <NavbarItem className="hidden lg:flex">{searchInput}</NavbarItem>
-      </NavbarContent>
-
-      <NavbarContent className="sm:hidden basis-1 pl-4" justify="end">
-        <NextUiLink
-          isExternal
-          href={siteConfig.links.github}
-          aria-label="Github"
-        >
-          <GithubIcon className="text-default-500" />
-        </NextUiLink>
-        <ThemeSwitch />
-        <NavbarMenuToggle />
-      </NavbarContent>
-    </NextUINavbar>
-  );
-};
diff --git a/frontend/messages/en.json b/frontend/messages/en.json
index 92147ed..139845f 100644
--- a/frontend/messages/en.json
+++ b/frontend/messages/en.json
@@ -2,8 +2,22 @@
   "Index": {
     "title": "Hello world!"
   },
-  "ProjectPage": {
-    "projects": "Projects",
-    "newProject": "New Project"
+  "Projects": {
+    "projects": "プロジェクト",
+    "project": "プロジェクト",
+    "new_project": "新規プロジェクト",
+    "edit_project": "プロジェクトの編集",
+    "delete_project": "プロジェクトの削除",
+    "id": "ID",
+    "name": "名前",
+    "detail": "詳細",
+    "last_update": "最終更新",
+    "actions": "アクション",
+    "project_name": "プロジェクト名",
+    "project_detail": "プロジェクト詳細",
+    "close": "閉じる",
+    "create": "作成",
+    "update": "作成",
+    "please_enter": "プロジェクト名を入力してください"
   }
-}
\ No newline at end of file
+}
diff --git a/frontend/messages/ja.json b/frontend/messages/ja.json
index 8349a16..b194e49 100644
--- a/frontend/messages/ja.json
+++ b/frontend/messages/ja.json
@@ -2,8 +2,22 @@
   "Index": {
     "title": "はろー"
   },
-  "ProjectPage": {
-    "projects": "プロジェクト",
-    "newProject": "プロジェクトの作成"
+  "Projects": {
+    "projects": "Projects",
+    "project": "Project",
+    "new_project": "New Project",
+    "edit_project": "Edit Project",
+    "delete_project": "Delete Project",
+    "id": "ID",
+    "name": "Name",
+    "detail": "Detail",
+    "last_update": "Last update",
+    "actions": "Actions",
+    "project_name": "Project Name",
+    "project_detail": "Project Detail",
+    "close": "Close",
+    "create": "Create",
+    "update": "Update",
+    "please_enter": "Please enter project name"
   }
 }
diff --git a/frontend/src/app/[locale]/Header.tsx b/frontend/src/app/[locale]/Header.tsx
new file mode 100644
index 0000000..50a40ad
--- /dev/null
+++ b/frontend/src/app/[locale]/Header.tsx
@@ -0,0 +1,65 @@
+import {
+  Navbar as NextUINavbar,
+  NavbarContent,
+  NavbarMenuToggle,
+  NavbarBrand,
+  NavbarItem,
+  Link as NextUiLink
+} from "@nextui-org/react";
+import { useTranslations } from "next-intl";
+import { siteConfig } from "@/config/site";
+import { Link } from "@/src/navigation";
+import LangSwitch from "./LangSwitch";
+import { ThemeSwitch } from "@/components/theme-switch";
+import { GithubIcon } from "@/components/icons";
+
+import Image from "next/image";
+
+export default function Header(params: { locale: string }) {
+  const t = useTranslations("Index");
+
+  return (
+    <NextUINavbar maxWidth="xl" position="sticky" className="bg-inherit">
+      <NavbarContent className="basis-1/5 sm:basis-full" justify="start">
+        <NavbarBrand as="li" className="gap-3 max-w-fit">
+          <Link
+            className="flex justify-start items-center gap-1"
+            href="/"
+            locale={params.locale}
+          >
+            <Image
+              src="/favicon/android-chrome-192x192.png"
+              width={32}
+              height={32}
+              alt="Logo"
+            />
+            <p className="font-bold text-inherit">Test Case Manager</p>
+          </Link>
+        </NavbarBrand>
+        {siteConfig.navItems.map((item) => (
+          <NavbarItem key={item.href}>
+            <Link
+              className="data-[active=true]:text-primary data-[active=true]:font-medium"
+              href={item.href}
+              locale={params.locale}
+            >
+              {item.label}
+            </Link>
+          </NavbarItem>
+        ))}
+      </NavbarContent>
+
+      <NavbarContent className="basis-1 pl-4" justify="end">
+        <NextUiLink
+          isExternal
+          href="https://github.com/kimatata/TestCaseManager"
+          aria-label="Github"
+        >
+          <GithubIcon className="text-default-500" />
+        </NextUiLink>
+        <ThemeSwitch />
+        <LangSwitch locale={params.locale} />
+      </NavbarContent>
+    </NextUINavbar>
+  );
+}
diff --git a/frontend/src/app/[locale]/LangSwitch.tsx b/frontend/src/app/[locale]/LangSwitch.tsx
new file mode 100644
index 0000000..8cde304
--- /dev/null
+++ b/frontend/src/app/[locale]/LangSwitch.tsx
@@ -0,0 +1,44 @@
+"use client";
+import {
+  Button,
+  DropdownTrigger,
+  Dropdown,
+  DropdownMenu,
+  DropdownItem,
+} from "@nextui-org/react";
+import { Globe } from "lucide-react";
+import { useRouter } from "@/src/navigation";
+
+const locales = [
+  { code: "en", name: "English" },
+  { code: "ja", name: "日本語" },
+];
+
+export default function LangSwitch(params: { locale: string }) {
+  const router = useRouter();
+
+  async function changeLocale(locale: string) {
+    router.push("/", { locale: locale });
+  }
+
+  return (
+    <Dropdown>
+      <DropdownTrigger>
+        <Button size="sm" color="primary" startContent={<Globe size={16} />}>
+          {locales.find((locale) => locale.code === params.locale)?.name ||
+            params.locale}
+        </Button>
+      </DropdownTrigger>
+      <DropdownMenu aria-label="lacales">
+        {locales.map((entry) => (
+          <DropdownItem
+            key={entry.code}
+            onClick={() => changeLocale(entry.code)}
+          >
+            {entry.name}
+          </DropdownItem>
+        ))}
+      </DropdownMenu>
+    </Dropdown>
+  );
+}
diff --git a/frontend/src/app/[locale]/layout.tsx b/frontend/src/app/[locale]/layout.tsx
index 28b3d87..97a35ff 100644
--- a/frontend/src/app/[locale]/layout.tsx
+++ b/frontend/src/app/[locale]/layout.tsx
@@ -3,7 +3,7 @@ import { Metadata } from "next";
 import { siteConfig } from "@/config/site";
 import { fontSans } from "@/config/fonts";
 import { Providers } from "./providers";
-import { Navbar } from "@/components/navbar";
+import Header from "./Header";
 import clsx from "clsx";
 
 export const metadata: Metadata = {
@@ -41,7 +41,7 @@ export default function RootLayout({
       >
         <Providers themeProps={{ attribute: "class", defaultTheme: "dark" }}>
           <div className="relative flex flex-col min-h-screen light:bg-neutral-50 dark:bg-neutral-800">
-            <Navbar />
+            <Header locale={locale} />
             <main>{children}</main>
             {/* <footer className="w-full flex items-center justify-center py-3">
               <Link