diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 649c409..3cd0874 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,13 +1,11 @@
 import React, { useEffect, useState } from 'react'
 import { BrowserRouter as Router, Route, Routes, Navigate } from 'react-router-dom'
-import HomePage from '@/pages/HomePage'
 import TagPage from '@/pages/TagPage'
 import TopNav from '@/components/TopNav'
 import TagSidebar from '@/components/TagSidebar'
 import PostPage from '@/pages/PostPage'
 import PostNewPage from '@/pages/PostNewPage'
 import PostDetailPage from '@/pages/PostDetailPage'
-import WikiPage from '@/pages/WikiPage'
 import WikiNewPage from '@/pages/WikiNewPage'
 import WikiDetailPage from '@/pages/WikiDetailPage'
 import { API_BASE_URL } from '@/config'
@@ -15,21 +13,7 @@ import axios from 'axios'
 import { Toaster } from '@/components/ui/toaster'
 import { camelizeKeys } from 'humps'
 
-type Tag = { id:        number
-             name:      string
-             category:  string }
-
-type Post = { id:         number
-              url:        string
-              title:      string
-              thumbnail:  string
-              tags:       Tag[]
-              viewed:     boolean }
-
-type User = { id:               number
-              name:             string | null
-              inheritanceCode:  string
-              role:             string }
+import type { Post, Tag, User } from '@/types'
 
 
 const App = () => {
@@ -83,7 +67,6 @@ const App = () => {
                   <Route path="/posts/new" element={<PostNewPage />} />
                   <Route path="/posts/:id" element={<PostDetailPage posts={posts} setPosts={setPosts} />} />
                   <Route path="/tags/:tag" element={<TagPage />} />
-                  <Route path="/wiki" element={<WikiPage />} />
                   <Route path="/wiki/:name" element={<WikiDetailPage />} />
                   <Route path="/wiki/new" element={<WikiNewPage />} />
                   {/* <Route path="/wiki/:id/edit" element={<WikiEditPage />} /> */}
diff --git a/frontend/src/components/SettingsDialogue.tsx b/frontend/src/components/SettingsDialogue.tsx
index 368aed7..b3267c2 100644
--- a/frontend/src/components/SettingsDialogue.tsx
+++ b/frontend/src/components/SettingsDialogue.tsx
@@ -6,18 +6,10 @@ import { Input } from '@/components/ui/input'
 import { toast } from '@/components/ui/use-toast'
 import axios from 'axios'
 import { Link, useNavigate, useLocation } from 'react-router-dom'
-import { API_BASE_URL } from '../config'
+import { API_BASE_URL } from '@/config'
 import { camelizeKeys } from 'humps'
 
-type Tag = { id:        number
-             name:      string
-             category:  string
-             count?:    number }
-
-type User = { id:               number
-              name:             string | null
-              inheritanceCode:  string
-              role:             string }
+import type { Tag, User } from '@/types'
 
 type Props = { visible:         boolean
                onVisibleChange: (visible: boolean) => void
diff --git a/frontend/src/components/TagSearch.tsx b/frontend/src/components/TagSearch.tsx
index a6b51c3..f060a7b 100644
--- a/frontend/src/components/TagSearch.tsx
+++ b/frontend/src/components/TagSearch.tsx
@@ -1,13 +1,10 @@
 import React, { useEffect, useState } from 'react'
 import axios from 'axios'
 import { Link, useNavigate, useLocation } from 'react-router-dom'
-import { API_BASE_URL } from '../config'
+import { API_BASE_URL } from '@/config'
 import TagSearchBox from './TagSearchBox'
 
-type Tag = { id:        number
-             name:      string
-             category:  string
-             count?:    number }
+import type { Tag } from '@/types'
 
 
 const TagSearch: React.FC = () => {
diff --git a/frontend/src/components/TagSearchBox.tsx b/frontend/src/components/TagSearchBox.tsx
index 8ec9714..3f5e3c3 100644
--- a/frontend/src/components/TagSearchBox.tsx
+++ b/frontend/src/components/TagSearchBox.tsx
@@ -3,10 +3,7 @@ import axios from 'axios'
 import { Link, useNavigate, useLocation } from 'react-router-dom'
 import { API_BASE_URL } from '../config'
 
-type Tag = { id:        number
-             name:      string
-             category:  string
-             count?:    number }
+import type { Tag } from '@/types'
 
 type Props = { suggestions: Tag[]
                activeIndex: number
diff --git a/frontend/src/components/TagSidebar.tsx b/frontend/src/components/TagSidebar.tsx
index 16db20a..264d753 100644
--- a/frontend/src/components/TagSidebar.tsx
+++ b/frontend/src/components/TagSidebar.tsx
@@ -4,22 +4,10 @@ import { Link, useParams } from 'react-router-dom'
 import { API_BASE_URL } from '../config'
 import TagSearch from './TagSearch'
 
-type Tag = { id:        number
-             name:      string
-             category:  string }
+import type { Post, Tag } from '@/types'
 
 type TagByCategory = { [key: string]: Tag[] }
 
-type OriginalTag = { id:        number
-                     name:      string
-                     category:  string }
-
-type Post = { id:         number
-              url:        string
-              title:      string
-              thumbnail:  string
-              tags:       Tag[] }
-
 type Props = { posts:     Post[]
                setPosts:  (posts: Post[]) => void }
 
diff --git a/frontend/src/components/TopNav.tsx b/frontend/src/components/TopNav.tsx
index 83e1468..df0304b 100644
--- a/frontend/src/components/TopNav.tsx
+++ b/frontend/src/components/TopNav.tsx
@@ -4,10 +4,7 @@ import SettingsDialogue from './SettingsDialogue'
 import { Button } from './ui/button'
 import clsx from 'clsx'
 
-type User = { id:               number
-              name:             string | null
-              inheritanceCode:  string
-              role:             string }
+import type { User } from '@/types'
 
 type Props = { user:    User
                setUser: (user: User) => void }
diff --git a/frontend/src/components/WikiEditor/index.tsx b/frontend/src/components/WikiEditor/index.tsx
deleted file mode 100644
index 678647e..0000000
--- a/frontend/src/components/WikiEditor/index.tsx
+++ /dev/null
@@ -1,19 +0,0 @@
-import MdEditor from 'react-markdown-editor-lite'
-import 'react-markdown-editor-lite/lib/index.css'
-import { marked } from 'marked'
-
-type Props = { value:     string
-               onChange:  (text: string) => void
-               onSave:    () => void }
-
-
-const WikiEditor = ({ value, onChange, onSave }) => (
-    <div className="wiki-editor">
-      <MdEditor value={value}
-                style={{ height: '500px' }}
-                renderHTML={text => marked (text)} />
-      <button onClick={onSave}>保存</button>
-    </div>)
-
-
-export default WikiEditor
diff --git a/frontend/src/pages/HomePage.tsx b/frontend/src/pages/HomePage.tsx
deleted file mode 100644
index 4d1c8a0..0000000
--- a/frontend/src/pages/HomePage.tsx
+++ /dev/null
@@ -1,40 +0,0 @@
-import React, { useEffect, useState } from 'react'
-import { Link } from 'react-router-dom'
-import axios from 'axios'
-import { API_BASE_URL, SITE_TITLE } from '../config'
-
-const HomePage = () => {
-  const [posts, setPosts] = useState([])
-
-  useEffect(() => {
-    const fetchPosts = async () => {
-      try {
-        const response = await axios.get(`${ API_BASE_URL }/posts`)
-        setPosts(response.data)
-      } catch (error) {
-        console.error('Failed to fetch posts:', error)
-      }
-    }
-    fetchPosts()
-    document.title = `${ SITE_TITLE }　〜 ぼざクリも、ぼざろ外も、外伝もあるんだよ。`
-  }, [])
-
-  return (
-    <div className="flex flex-wrap gap-4 p-4">
-      {posts.map (post => (
-        <Link
-          to={`/posts/${post.id}`}
-          key={post.id}
-          className="w-40 h-40 overflow-hidden rounded-lg shadow-md hover:shadow-lg"
-        >
-          <img
-            src={post.thumbnail}
-            className="object-cover w-full h-full"
-          />
-        </Link>
-      ))}
-    </div>
-  )
-}
-
-export default HomePage
diff --git a/frontend/src/pages/PostDetailPage.tsx b/frontend/src/pages/PostDetailPage.tsx
index 46546ec..87a35ef 100644
--- a/frontend/src/pages/PostDetailPage.tsx
+++ b/frontend/src/pages/PostDetailPage.tsx
@@ -7,16 +7,7 @@ import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { cn } from '@/lib/utils'
 
-type Tag = { id:        number
-             name:      string
-             category:  string }
-
-type Post = { id:         number
-              url:        string
-              title:      string
-              thumbnail:  string
-              tags:       Tag[]
-              viewed:     boolean }
+import type { Post, Tag } from '@/types'
 
 type Props = { posts:     Post[]
                setPosts:  (posts: Post[]) => void }
diff --git a/frontend/src/pages/PostNewPage.tsx b/frontend/src/pages/PostNewPage.tsx
index 9aba795..c61e366 100644
--- a/frontend/src/pages/PostNewPage.tsx
+++ b/frontend/src/pages/PostNewPage.tsx
@@ -7,16 +7,8 @@ import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { cn } from '@/lib/utils'
 
-type Tag = { id:        number
-             name:      string
-             category:  string }
-
-type Post = { id:         number
-              url:        string
-              title:      string
-              thumbnail:  string
-              tags:       Tag[]
-              viewed:     boolean }
+import type { Post, Tag } from '@/types'
+
 
 type Props = { posts:     Post[]
                setPosts:  (posts: Post[]) => void }
diff --git a/frontend/src/pages/PostPage.tsx b/frontend/src/pages/PostPage.tsx
index 50539f0..cb7d7c8 100644
--- a/frontend/src/pages/PostPage.tsx
+++ b/frontend/src/pages/PostPage.tsx
@@ -1,18 +1,9 @@
 import React, { useEffect, useState } from 'react'
 import { Link, useLocation } from 'react-router-dom'
 import axios from 'axios'
-import { API_BASE_URL, SITE_TITLE } from '../config'
+import { API_BASE_URL, SITE_TITLE } from '@/config'
 
-type Tag = { id:        number
-             name:      string
-             category:  string }
-
-type Post = { id:         number
-              url:        string
-              title:      string
-              thumbnail:  string
-              tags:       Tag[]
-              viewed:     boolean }
+import type { Post, Tag } from '@/types'
 
 type Props = { posts:     Post[]
                setPosts:  (posts: Post[]) => void }
diff --git a/frontend/src/pages/WikiNewPage.tsx b/frontend/src/pages/WikiNewPage.tsx
index 5499f21..2f46021 100644
--- a/frontend/src/pages/WikiNewPage.tsx
+++ b/frontend/src/pages/WikiNewPage.tsx
@@ -10,9 +10,7 @@ import MarkdownIt from 'markdown-it'
 import MdEditor from 'react-markdown-editor-lite'
 import 'react-markdown-editor-lite/lib/index.css'
 
-type Tag = { id:        number
-             name:      string
-             category:  string }
+import type { Tag } from '@/types'
 
 const mdParser = new MarkdownIt
 
diff --git a/frontend/src/pages/WikiPage.tsx b/frontend/src/pages/WikiPage.tsx
deleted file mode 100644
index 49343eb..0000000
--- a/frontend/src/pages/WikiPage.tsx
+++ /dev/null
@@ -1,25 +0,0 @@
-import axios from 'axios'
-import { useState, useEffect } from 'react'
-import WikiEditor from '@/components/WikiEditor'
-import { API_BASE_URL } from '../config'
-
-
-const WikiPage = () => {
-  const [text, setText] = useState ('')
-
-  useEffect (() => {
-    void (axios.get (`${ API_BASE_URL }/wiki/load`, { params: { page: 'xxx' } })
-          .then (res => setText (res.data.markdown)))
-  }, [])
-
-  const save = () => {
-    void (axios.post ('/api/wiki/save', { page:     'xxx',
-                                          markdown: text })
-          .catch (err => console.error ('保存失敗', err)))
-  }
-
-  return <WikiEditor value={text} onChange={setText} onSave={save} />
-}
-
-
-export default WikiPage
diff --git a/frontend/src/types.ts b/frontend/src/types.ts
new file mode 100644
index 0000000..22c3069
--- /dev/null
+++ b/frontend/src/types.ts
@@ -0,0 +1,19 @@
+export type Post = {
+    id:         number
+    url:        string
+    title:      string
+    thumbnail:  string
+    tags:       Tag[]
+    viewed:     boolean }
+
+export type Tag = {
+    id:       number
+    name:     string
+    category: string
+    count?:   number}
+
+export type User = {
+    id:               number
+    name:             string | null
+    inheritanceCode:  string
+    role:             string }