diff --git a/backend/app/controllers/nico_tags_controller.rb b/backend/app/controllers/nico_tags_controller.rb
index a3c611d..9b1b06a 100644
--- a/backend/app/controllers/nico_tags_controller.rb
+++ b/backend/app/controllers/nico_tags_controller.rb
@@ -3,7 +3,7 @@ class NicoTagsController < ApplicationController
     limit = (params[:limit] || 20).to_i
     cursor = params[:cursor].presence
 
-    q = Tag.nico_tags.includes(:linked_tags)
+    q = Tag.nico_tags.includes(:linked_tags).order(updated_at: :desc)
     q = q.where('tags.updated_at < ?', Time.iso8601(cursor)) if cursor
 
     tags = q.limit(limit + 1)
@@ -19,6 +19,23 @@ class NicoTagsController < ApplicationController
     }, next_cursor: }
   end
 
-  def upload
+  def update
+    return head :unauthorized unless current_user
+    return head :forbidden unless current_user.member?
+
+    id = params[:id].to_i
+
+    tag = Tag.find(id)
+    return head :bad_request if tag.category != 'nico'
+
+    linked_tag_names = params[:tags].to_s.split(' ')
+    linked_tags = Tag.normalise_tags(linked_tag_names, with_tagme: false)
+    return head :bad_request if linked_tags.filter { |t| t.category == 'nico' }.present?
+
+    tag.linked_tags = linked_tags
+    tag.updated_at = Time.now
+    tag.update!
+
+    render json: tag.linked_tags, status: :ok
   end
 end
diff --git a/backend/app/controllers/posts_controller.rb b/backend/app/controllers/posts_controller.rb
index f401882..60f3577 100644
--- a/backend/app/controllers/posts_controller.rb
+++ b/backend/app/controllers/posts_controller.rb
@@ -63,7 +63,7 @@ class PostsController < ApplicationController
     post.thumbnail.attach(thumbnail)
     if post.save
       post.resized_thumbnail!
-      post.tags = normalise_tags(tags_names)
+      post.tags = Tag.normalise_tags(tags_names)
       render json: post.as_json(include: { tags: { only: [:id, :name, :category] } }),
              status: :created
     else
@@ -94,10 +94,10 @@ class PostsController < ApplicationController
     tag_names = params[:tags].to_s.split(' ')
 
     post = Post.find(params[:id].to_i)
-    tags = post.tags.where(category: 'nico').to_a + normalise_tags(tag_names)
+    tags = post.tags.where(category: 'nico').to_a + Tag.normalise_tags(tag_names)
     if post.update(title:, tags:)
       render json: post.as_json(include: { tags: { only: [:id, :name, :category] } }),
-             status: :created
+             status: :ok
     else
       render json: post.errors, status: :unprocessable_entity
     end
@@ -109,14 +109,6 @@ class PostsController < ApplicationController
 
   private
 
-  CATEGORY_PREFIXES = {
-      'gen:'  => 'general',
-      'djk:'  => 'deerjikist',
-      'meme:' => 'meme',
-      'chr:'  => 'character',
-      'mtr:'  => 'material',
-      'meta:' => 'meta' }.freeze
-
   def filtered_posts
     tag_names = params[:tags]&.split(' ')
     match_type = params[:match]
@@ -134,19 +126,4 @@ class PostsController < ApplicationController
     end
     posts.distinct
   end
-
-  def normalise_tags tag_names
-    tags = tag_names.map do |name|
-      pf, cat = CATEGORY_PREFIXES.find { |p, _| name.start_with?(p) } || ['', nil]
-      name.delete_prefix!(pf)
-      Tag.find_or_initialize_by(name:).tap do |tag|
-        if cat && tag.category != cat
-          tag.category = cat
-          tag.save!
-        end
-      end
-    end
-    tags << Tag.tagme if tags.size < 20 && tags.none?(Tag.tagme)
-    tags.uniq
-  end
 end
diff --git a/backend/app/models/tag.rb b/backend/app/models/tag.rb
index a8239f6..137afff 100644
--- a/backend/app/models/tag.rb
+++ b/backend/app/models/tag.rb
@@ -26,6 +26,14 @@ class Tag < ApplicationRecord
 
   scope :nico_tags, -> { where(category: :nico) }
 
+  CATEGORY_PREFIXES = {
+      'gen:'  => 'general',
+      'djk:'  => 'deerjikist',
+      'meme:' => 'meme',
+      'chr:'  => 'character',
+      'mtr:'  => 'material',
+      'meta:' => 'meta' }.freeze
+
   def self.tagme
     @tagme ||= Tag.find_or_initialize_by(name: 'タグ希望') do |tag|
       tag.category = 'meta'
@@ -38,11 +46,26 @@ class Tag < ApplicationRecord
     end
   end
 
+  def self.normalise_tags tag_names, with_tagme: true
+    tags = tag_names.map do |name|
+      pf, cat = CATEGORY_PREFIXES.find { |p, _| name.start_with?(p) } || ['', nil]
+      name.delete_prefix!(pf)
+      Tag.find_or_initialize_by(name:).tap do |tag|
+        if cat && tag.category != cat
+          tag.category = cat
+          tag.save!
+        end
+      end
+    end
+    tags << Tag.tagme if with_tagme && tags.size < 20 && tags.none?(Tag.tagme)
+    tags.uniq
+  end
+
   private
 
   def nico_tag_name_must_start_with_nico
-    if ((category == 'nico' && name&.[](0, 5) != 'nico:') || 
-        (category != 'nico' && name&.[](0, 5) == 'nico:'))
+    if ((category == 'nico' && !(name.start_with?('nico:'))) || 
+        (category != 'nico' && name.start_with?('nico:')))
       errors.add :name, 'ニコニコ・タグの命名規則に反してゐます．'
     end
   end
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 691fc67..0e8f93f 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -63,7 +63,7 @@ export default () => {
 		<Route path="/posts" element={<PostListPage />} />
 		<Route path="/posts/new" element={<PostNewPage />} />
 		<Route path="/posts/:id" element={<PostDetailPage user={user} />} />
-		<Route path="/tags/nico" element={<NicoTagListPage />} />
+		<Route path="/tags/nico" element={<NicoTagListPage user={user} />} />
 		<Route path="/wiki" element={<WikiSearchPage />} />
 		<Route path="/wiki/:title" element={<WikiDetailPage />} />
 		<Route path="/wiki/new" element={<WikiNewPage />} />
diff --git a/frontend/src/components/TopNav.tsx b/frontend/src/components/TopNav.tsx
index bcd3ab2..70af9c2 100644
--- a/frontend/src/components/TopNav.tsx
+++ b/frontend/src/components/TopNav.tsx
@@ -166,7 +166,8 @@ export default ({ user }: Props) => {
 	    return (
 		<div className={className}>
 		  <Link to="/posts" className={subClass}>一覧</Link>
-		  <Link to="/posts/new" className={subClass}>投稿追加</Link>
+		  {['admin', 'member'].some (r => user?.role === r) && (
+		      <Link to="/posts/new" className={subClass}>投稿追加</Link>)}
 		  <Link to="/wiki/ヘルプ:広場" className={subClass}>ヘルプ</Link>
 		</div>)
 	  case Menu.Tag:
diff --git a/frontend/src/components/ui/use-toast.tsx b/frontend/src/components/ui/use-toast.tsx
index 83c24fd..43c3e4b 100644
--- a/frontend/src/components/ui/use-toast.tsx
+++ b/frontend/src/components/ui/use-toast.tsx
@@ -6,7 +6,7 @@ import * as React from "react"
 import type {
   ToastActionElement,
   ToastProps,
-} from "@/registry/default/ui/toast"
+} from "./toast"
 
 const TOAST_LIMIT = 1
 const TOAST_REMOVE_DELAY = 1000000
diff --git a/frontend/src/pages/posts/PostDetailPage.tsx b/frontend/src/pages/posts/PostDetailPage.tsx
index 86293e5..20ac87d 100644
--- a/frontend/src/pages/posts/PostDetailPage.tsx
+++ b/frontend/src/pages/posts/PostDetailPage.tsx
@@ -102,7 +102,7 @@ export default ({ user }: Props) => {
 		  {post.viewed ? '閲覧済' : '未閲覧'}
 		</Button>
 		<TabGroup>
-		  {(['admin', 'member'].some (r => r === user?.role) && editing) && (
+		  {(['admin', 'member'].some (r => user?.role === r) && editing) && (
 		      <Tab name="編輯">
 			<PostEditForm post={post}
 				      onSave={newPost => {
diff --git a/frontend/src/pages/posts/PostNewPage.tsx b/frontend/src/pages/posts/PostNewPage.tsx
index a6e67dc..349ce99 100644
--- a/frontend/src/pages/posts/PostNewPage.tsx
+++ b/frontend/src/pages/posts/PostNewPage.tsx
@@ -28,22 +28,25 @@ export default () => {
   const previousURLRef = useRef ('')
 
   const handleSubmit = async () => {
-    const formData = new FormData ()
+    const formData = new FormData
     formData.append ('title', title)
     formData.append ('url', url)
     formData.append ('tags', tags)
     if (thumbnailFile)
       formData.append ('thumbnail', thumbnailFile)
 
-    void (axios.post (`${ API_BASE_URL }/posts`, formData, { headers: {
-	      'Content-Type':	  'multipart/form-data',
-	      'X-Transfer-Code':  localStorage.getItem ('user_code') || '' } })
-	  .then (() => {
-	    toast ({ title: '投稿成功!' })
-	    navigate ('/posts')
-	  })
-	  .catch (() => toast ({ title:        '投稿失敗',
-				 description:  '入力を確認してください。' })))
+    try
+    {
+      await axios.post (`${ API_BASE_URL }/posts`, formData, { headers: {
+	  'Content-Type':     'multipart/form-data',
+	  'X-Transfer-Code':  localStorage.getItem ('user_code') ?? '' } })
+      toast ({ title: '投稿成功!' })
+      navigate ('/posts')
+    }
+    catch
+    {
+      toast ({ title: '投稿失敗', description: '入力を確認してください。' })
+    }
   }
 
   useEffect (() => {
diff --git a/frontend/src/pages/tags/NicoTagListPage.tsx b/frontend/src/pages/tags/NicoTagListPage.tsx
index 72ac3dc..b9959d8 100644
--- a/frontend/src/pages/tags/NicoTagListPage.tsx
+++ b/frontend/src/pages/tags/NicoTagListPage.tsx
@@ -1,35 +1,88 @@
 import axios from 'axios'
 import toCamel from 'camelcase-keys'
-import { useEffect, useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
 import SectionTitle from '@/components/common/SectionTitle'
 import TextArea from '@/components/common/TextArea'
 import MainArea from '@/components/layout/MainArea'
+import { toast } from '@/components/ui/use-toast'
 import { API_BASE_URL, SITE_TITLE } from '@/config'
 
-import type { NicoTag } from '@/types'
+import type { NicoTag, Tag, User } from '@/types'
 
+type Props = { user: User | null }
 
-export default () => {
+
+export default ({ user }: Props) => {
   const [nicoTags, setNicoTags] = useState<NicoTag[]> ([])
+  const [cursor, setCursor] = useState ('')
+  const [loading, setLoading] = useState (false)
   const [editing, setEditing] = useState<{ [key: number]: boolean }> ({ })
   const [rawTags, setRawTags] = useState<{ [key: number]: string }> ({ })
 
-  useEffect (() => {
-    void (async () => {
-      const res = await axios.get (`${ API_BASE_URL }/tags/nico`)
-      const data = toCamel (res.data as any, { deep: true }) as { tags: NicoTag[] }
+  const loaderRef = useRef<HTMLDivElement | null> (null)
+
+  const memberFlg = ['admin', 'member'].some (r => user?.role === r)
+
+  const loadMore = async (withCursor: boolean) => {
+    setLoading (true)
+
+    const res = await axios.get (`${ API_BASE_URL }/tags/nico`, {
+	params: { ...(withCursor ? { cursor } : { }) } })
+    const data = toCamel (res.data as any, { deep: true }) as { tags:       NicoTag[]
+								nextCursor: string }
+
+    setNicoTags (tags => [...(withCursor ? tags : []), ...data.tags])
+    setCursor (data.nextCursor)
+
+    const newEditing = Object.fromEntries (data.tags.map (t => [t.id, false]))
+    setEditing (editing => ({ ...editing, ...newEditing }))
+
+    const newRawTags = Object.fromEntries (
+	data.tags.map (t => [t.id, t.linkedTags.map (lt => lt.name).join (' ')]))
+    setRawTags (rawTags => ({ ...rawTags, ...newRawTags }))
 
-      setNicoTags (data.tags)
+    setLoading (false)
+  }
 
-      const newEditing = Object.fromEntries (data.tags.map (t => [t.id, false]))
-      setEditing (editing => ({ ...editing, ...newEditing }))
+  const handleEdit = async (id: number) => {
+    if (editing[id])
+      {
+	const formData = new FormData
+	formData.append ('tags', rawTags[id])
 
-      const newRawTags = Object.fromEntries (
-	  data.tags.map (t => [t.id, t.linkedTags.map (lt => lt.name).join (' ')]))
-      setRawTags (rawTags => ({ ...rawTags, ...newRawTags }))
-    }) ()
+	const res = await axios.put (`${ API_BASE_URL }/tags/nico/${ id }`, formData, { headers: {
+	    'Content-Type':     'multipart/form-data',
+	    'X-Transfer-Code':  localStorage.getItem ('user_code') ?? '' } })
+	const data = toCamel (res.data as any, { deep: true }) as Tag[]
+	setRawTags (rawTags => ({ ...rawTags, [id]: data.map (t => t.name).join (' ') }))
+
+	toast ({ title: '更新しました．' })
+      }
+
+    setEditing (editing => ({ ...editing, [id]: !(editing[id]) }))
+  }
+
+  useEffect(() => {
+    const observer = new IntersectionObserver (entries => {
+      if (entries[0].isIntersecting && !(loading) && cursor)
+	loadMore (true)
+    }, { threshold: 1 })
+
+    const target = loaderRef.current
+    if (target)
+      observer.observe (target)
+
+    return () => {
+      if (target)
+	observer.unobserve (target)
+    }
+  }, [loaderRef, loading])
+
+  useEffect (() => {
+    setNicoTags ([])
+    loadMore (false)
   }, [])
 
   return (
@@ -43,38 +96,45 @@ export default () => {
 	</div>
 
 	<div className="mt-4">
-	  <table className="table-auto w-full border-collapse">
-	    <thead>
-	      <tr>
-		<th className="p-2 text-left">ニコニコタグ</th>
-		<th className="p-2 text-left">連携タグ</th>
-		<th></th>
-	      </tr>
-	    </thead>
-	    <tbody>
-	      {nicoTags.map (tag => (
-		  <tr key={tag.id}>
-		    <td className="p-2">
-		      {tag.name}
-		    </td>
-		    <td className="p-2">
-		      {editing[tag.id]
-		       ? (
-			  <TextArea value={rawTags[tag.id]} onChange={ev => {
-			    setRawTags (rawTags => ({ ...rawTags, [tag.id]: ev.target.value }))
-			  }} />)
-		       : rawTags[tag.id]}
-		    </td>
-		    <td>
-		      <a href="#" onClick={() => {
-			setEditing (editing => ({ ...editing, [tag.id]: !(editing[tag.id]) }))
-		      }}>
-			{editing[tag.id] ? <span className="text-red-400">更新</span> : '編輯'}
-		      </a>
-		    </td>
-		  </tr>))}
-	    </tbody>
-	  </table>
+	  {nicoTags.length > 0 && (
+	      <table className="table-auto w-full border-collapse mb-4">
+		<thead>
+		  <tr>
+		    <th className="p-2 text-left">ニコニコタグ</th>
+		    <th className="p-2 text-left">連携タグ</th>
+		    {memberFlg && <th></th>}
+		  </tr>
+		</thead>
+		<tbody>
+		  {nicoTags.map (tag => (
+		      <tr key={tag.id}>
+			<td className="p-2">
+			  <a href={`/posts?${ (new URLSearchParams ({ tags: tag.name })).toString () }`}
+			     target="_blank">
+			    {tag.name}
+			  </a>
+			</td>
+			<td className="p-2">
+			  {editing[tag.id]
+			   ? (
+			      <TextArea value={rawTags[tag.id]} onChange={ev => {
+				setRawTags (rawTags => ({ ...rawTags, [tag.id]: ev.target.value }))
+			      }} />)
+			   : rawTags[tag.id]}
+			</td>
+			{memberFlg && (
+			    <td>
+			      <a href="#" onClick={() => handleEdit (tag.id)}>
+			        {editing[tag.id]
+				 ? <span className="text-red-400">更新</span>
+				 : <span>編輯</span>}
+			      </a>
+			    </td>)}
+		      </tr>))}
+		</tbody>
+	      </table>)}
+	  {loading && 'Loading...'}
+	  <div ref={loaderRef} className="h-12"></div>
 	</div>
       </MainArea>)
 }