diff --git a/backend/app/controllers/tags_controller.rb b/backend/app/controllers/tags_controller.rb
index 94a7041..8d16e34 100644
--- a/backend/app/controllers/tags_controller.rb
+++ b/backend/app/controllers/tags_controller.rb
@@ -66,7 +66,7 @@ class TagsController < ApplicationController
             .offset(offset)
             .to_a
 
-    render json: { tags: TagRepr.base(tags), count: q.size }
+    render json: { tags: TagRepr.many(tags), count: q.size }
   end
 
   def with_depth
@@ -209,6 +209,46 @@ class TagsController < ApplicationController
     render json: build_tag_children(tag)
   end
 
+  def update_all
+    return head :unauthorized unless current_user
+    return head :forbidden unless current_user.gte_member?
+
+    tag = Tag.find_by(id: params[:id])
+    return head :not_found unless tag
+
+    name = params[:name].to_s.strip
+    category = params[:category].to_s.strip
+    return head :unprocessable_entity if name.blank? || category.blank?
+
+    if tag.nico? != (category == 'nico')
+      return render json: { error: 'ニコタグのカテゴリ変更はできません．' },
+                    status: :unprocessable_entity
+    end
+
+    alias_names = params[:aliases].to_s.split.uniq
+    parent_names = params[:parent_tags].to_s.split.uniq
+
+    ApplicationRecord.transaction do
+      TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
+
+      old_name = tag.name
+
+      tag.update!(category:)
+      tag.tag_name.update!(name:)
+
+      alias_names << old_name if name != old_name
+      alias_names.delete(name)
+
+      update_aliases!(tag, alias_names)
+      update_parent_tags!(tag, parent_names)
+
+      tag.reload
+      record_tag_version!(tag, event_type: :update, created_by_user: current_user)
+    end
+
+    render json: TagRepr.base(tag.reload)
+  end
+
   def update
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
@@ -237,7 +277,7 @@ class TagsController < ApplicationController
 
   private
 
-  def build_tag_children(tag)
+  def build_tag_children tag
     material = tag.materials.first
     file = nil
     content_type = nil
@@ -251,11 +291,43 @@ class TagsController < ApplicationController
         material: material.as_json&.merge(file:, content_type:))
   end
 
-  def record_tag_version!(tag, event_type:, created_by_user:)
+  def record_tag_version! tag, event_type:, created_by_user:
     if tag.nico?
       NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user:)
     else
       TagVersionRecorder.record!(tag:, event_type:, created_by_user:)
     end
   end
+
+  def update_aliases! tag, alias_names
+    current_aliases = tag.tag_name.aliases.to_a
+
+    current_aliases.each do |alias_tag_name|
+      next if alias_names.include?(alias_tag_name.name)
+
+      alias_tag_name.update!(canonical: nil)
+    end
+
+    alias_names.each do |alias_name|
+      alias_tag_name = TagName.find_undiscard_or_create_by!(name: alias_name)
+      alias_tag_name.update!(canonical: tag.tag_name)
+    end
+  end
+
+  def update_parent_tags! tag, parent_names
+    parent_tags = Tag.normalise_tags(parent_names, with_tagme: false,
+                                                   with_no_deerjikist: false,
+                                                   deny_nico: true)
+
+    TagVersioning.record_tag_snapshots!((tag.parents.to_a + parent_tags).uniq,
+                                        created_by_user: current_user)
+
+    tag.tag_implications.destroy_all
+
+    parent_tags.each do |parent_tag|
+      next if parent_tag == tag
+
+      TagImplication.create!(tag:, parent_tag:)
+    end
+  end
 end
diff --git a/backend/app/representations/tag_repr.rb b/backend/app/representations/tag_repr.rb
index df6925b..ecbed17 100644
--- a/backend/app/representations/tag_repr.rb
+++ b/backend/app/representations/tag_repr.rb
@@ -8,10 +8,9 @@ module TagRepr
   module_function
 
   def base tag
-    tag.as_json(BASE)
+    tag.as_json(BASE).merge(aliases: tag.snapshot_aliases,
+                            parents: tag.parents.map { _1.as_json(BASE) })
   end
 
-  def many tags
-    tags.map { |t| base(t) }
-  end
+  def many(tags) = tags.map { |t| base(t) }
 end
diff --git a/backend/config/routes.rb b/backend/config/routes.rb
index edd978f..373bb17 100644
--- a/backend/config/routes.rb
+++ b/backend/config/routes.rb
@@ -6,7 +6,7 @@ Rails.application.routes.draw do
     delete ':child_id', action: :destroy
   end
 
-  resources :tags, only: [:index, :show, :update] do
+  resources :tags, only: [:index, :show] do
     collection do
       get :autocomplete
       get :'with-depth', action: :with_depth
@@ -19,6 +19,9 @@ Rails.application.routes.draw do
     end
 
     member do
+      put '', action: :update_all
+      patch '', action: :update
+
       get :deerjikists
     end
   end
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 7316e8b..d6e5496 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -26,6 +26,7 @@ import PostNewPage from '@/pages/posts/PostNewPage'
 import PostSearchPage from '@/pages/posts/PostSearchPage'
 import ServiceUnavailable from '@/pages/ServiceUnavailable'
 import SettingPage from '@/pages/users/SettingPage'
+import TagDetailPage from '@/pages/tags/TagDetailPage'
 import TagListPage from '@/pages/tags/TagListPage'
 import TheatreDetailPage from '@/pages/theatres/TheatreDetailPage'
 import WikiDetailPage from '@/pages/wiki/WikiDetailPage'
@@ -55,6 +56,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	  <Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
 	  <Route path="/posts/changes" element={<PostHistoryPage/>}/>
 	  <Route path="/tags" element={<TagListPage/>}/>
+	  <Route path="/tags/:name" element={<TagDetailPage/>}/>
 	  <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
 	  <Route path="/theatres/:id" element={<TheatreDetailPage/>}/>
 	  <Route path="/materials" element={<MaterialBasePage/>}>
diff --git a/frontend/src/pages/tags/TagDetailPage.tsx b/frontend/src/pages/tags/TagDetailPage.tsx
new file mode 100644
index 0000000..d3ea122
--- /dev/null
+++ b/frontend/src/pages/tags/TagDetailPage.tsx
@@ -0,0 +1,133 @@
+import { useQuery, useQueryClient } from '@tanstack/react-query'
+import { useEffect, useState } from 'react'
+import { useParams } from 'react-router-dom'
+
+import Label from '@/components/common/Label'
+import PageTitle from '@/components/common/PageTitle'
+import MainArea from '@/components/layout/MainArea'
+import { toast } from '@/components/ui/use-toast'
+import { CATEGORIES, CATEGORY_NAMES } from '@/consts'
+import { apiPut } from '@/lib/api'
+import { postsKeys, tagsKeys } from '@/lib/queryKeys'
+import { fetchTagByName } from '@/lib/tags'
+
+import type { FC, FormEvent } from 'react'
+
+import type { Category, Tag } from '@/types'
+
+
+export default (() => {
+  const { name: nameRaw } = useParams ()
+  const tagName = String (nameRaw ?? '')
+  const tagKey = tagsKeys.show (tagName)
+
+  const { data: tag, isLoading: loading } = useQuery ({
+      queryKey: tagKey,
+      queryFn: () => fetchTagByName (tagName) })
+
+  const [name, setName] = useState ('')
+  const [category, setCategory] = useState<Category> ('general')
+  const [aliases, setAliases] = useState ('')
+  const [parentTags, setParentTags] = useState ('')
+
+  const qc = useQueryClient ()
+
+  const handleSubmit = async (e: FormEvent) => {
+    e.preventDefault ()
+
+    const formData = new FormData
+    formData.append ('name', name)
+    formData.append ('category', category)
+    formData.append ('aliases', aliases)
+    formData.append ('parent_tags', parentTags)
+
+    try
+    {
+      const data = await apiPut<Tag> (`/tags/${ tag?.id }`, formData)
+      setName (data.name)
+      setCategory (data.category as Category)
+      setAliases (data.aliases.join (' '))
+      setParentTags (data.parents.map (t => t.name).join (' '))
+
+      qc.invalidateQueries ({ queryKey: postsKeys.root })
+      qc.invalidateQueries ({ queryKey: tagsKeys.root })
+      toast ({ description: '更新しました．' })
+    }
+    catch
+    {
+      toast ({ description: '更新に失敗しました．' })
+    }
+  }
+
+  useEffect (() => {
+    if (!(tag))
+      return
+
+    setName (tag.name)
+    setCategory (tag.category as Category)
+    setAliases (tag.aliases?.join (' '))
+    setParentTags (tag.parents?.map (t => t.name).join (' '))
+  }, [tag])
+
+  return (
+      <MainArea>
+	{(loading || !(tag)) ? 'Loading...' : (
+	    <div className="max-w-xl">
+	      <PageTitle>{tag.name}</PageTitle>
+
+	      <form onSubmit={handleSubmit} className="my-4 space-y-2">
+		{/* 名称 */}
+		<div>
+		  <Label>名称</Label>
+		  <input
+		      type="text"
+		      value={name}
+		      onChange={e => setName (e.target.value)}
+		      className="w-full border p-2 rounded"/>
+		</div>
+
+		{/* カテゴリ */}
+		<div>
+		  <Label>カテゴリ</Label>
+		  <select
+		      value={category ?? ''}
+		      onChange={e => setCategory(e.target.value as Category)}
+		      className="w-full border p-2 rounded">
+		    {CATEGORIES.filter (cat => cat !== 'nico').map (cat => (
+			<option key={cat} value={cat}>
+			  {CATEGORY_NAMES[cat]}
+			</option>))}
+		  </select>
+		</div>
+
+		{/* 別名 */}
+		<div>
+		  <Label>別名</Label>
+		  <input
+		      type="text"
+		      value={aliases}
+		      onChange={e => setAliases (e.target.value)}
+		      className="w-full border p-2 rounded"/>
+		</div>
+
+		{/* 上位タグ */}
+		<div>
+		  <Label>上位タグ</Label>
+		  <input
+		      type="text"
+		      value={parentTags}
+		      onChange={e => setParentTags (e.target.value)}
+		      className="w-full border p-2 rounded"/>
+		</div>
+
+		<div className="py-3">
+		  <button
+		      type="submit"
+		      className="bg-blue-500 text-white px-4 py-2 rounded">
+		    更新
+		  </button>
+		</div>
+	      </form>
+	    </div>)}
+      </MainArea>)
+}) satisfies FC
diff --git a/frontend/src/pages/tags/TagListPage.tsx b/frontend/src/pages/tags/TagListPage.tsx
index e1ce2fc..6589b0d 100644
--- a/frontend/src/pages/tags/TagListPage.tsx
+++ b/frontend/src/pages/tags/TagListPage.tsx
@@ -260,7 +260,10 @@ export default (() => {
 		    {results.map (row => (
 			<tr key={row.id} className="even:bg-gray-100 dark:even:bg-gray-700">
 			  <td className="p-2">
-			    <TagLink tag={row} withCount={false}/>
+			    <TagLink
+				tag={row}
+				to={`/tags/${ encodeURIComponent (row.name) }`}
+				withCount={false}/>
 			  </td>
 			  <td className="p-2">{CATEGORY_NAMES[row.category]}</td>
 			  <td className="p-2 text-right">{row.postCount}</td>
diff --git a/frontend/src/pages/wiki/WikiDetailPage.tsx b/frontend/src/pages/wiki/WikiDetailPage.tsx
index 7eab461..4ead153 100644
--- a/frontend/src/pages/wiki/WikiDetailPage.tsx
+++ b/frontend/src/pages/wiki/WikiDetailPage.tsx
@@ -114,13 +114,15 @@ export default () => {
 		     {...(version && { to: `/wiki/${ encodeURIComponent (title) }` })}/>
 	  </h1>
 	  {loading ? <div>Loading...</div> : <WikiBody title={title} body={wikiPage?.body}/>}
-	</article>
 
-	{(!(version) && posts.length > 0) && (
-	    <TabGroup>
-	      <Tab name="広場">
-		<PostList posts={posts}/>
-	      </Tab>
-	    </TabGroup>)}
+	  {(!(version) && posts.length > 0) && (
+	      <div className="not-prose">
+		<TabGroup>
+		  <Tab name="広場">
+		    <PostList posts={posts}/>
+		  </Tab>
+		</TabGroup>
+	      </div>)}
+	</article>
       </MainArea>)
 }
diff --git a/frontend/src/types.ts b/frontend/src/types.ts
index 12f8838..8adb5ff 100644
--- a/frontend/src/types.ts
+++ b/frontend/src/types.ts
@@ -165,6 +165,8 @@ export type Tag = {
     id:             number
     name:           string
     category:       Category
+    aliases:        string[]
+    parents:        Tag[]
     postCount:      number
     createdAt:      string
     updatedAt:      string