diff --git a/backend/app/controllers/wiki_pages_controller.rb b/backend/app/controllers/wiki_pages_controller.rb
index e19557d..9e264fb 100644
--- a/backend/app/controllers/wiki_pages_controller.rb
+++ b/backend/app/controllers/wiki_pages_controller.rb
@@ -126,7 +126,7 @@ class WikiPagesController < ApplicationController
                           message:,
                           base_revision_id:)
 
-    render json: WikiPageRepr.base(page).merge(body:), status: :created
+    render json: WikiPageRepr.base(page).merge(body:)
   end
 
   def search
diff --git a/frontend/src/components/WikiBody.tsx b/frontend/src/components/WikiBody.tsx
index 50316b2..86381e5 100644
--- a/frontend/src/components/WikiBody.tsx
+++ b/frontend/src/components/WikiBody.tsx
@@ -4,6 +4,7 @@ import ReactMarkdown from 'react-markdown'
 import remarkGFM from 'remark-gfm'
 
 import PrefetchLink from '@/components/PrefetchLink'
+import WikiMarkdown from '@/components/WikiMarkdown'
 import SectionTitle from '@/components/common/SectionTitle'
 import SubsectionTitle from '@/components/common/SubsectionTitle'
 import { wikiKeys } from '@/lib/queryKeys'
@@ -16,33 +17,6 @@ import type { Components } from 'react-markdown'
 type Props = { title: string
 	       body?: string }
 
-const mdComponents = { h1:  ({ children }) => <SectionTitle>{children}</SectionTitle>,
-		       h2:  ({ children }) => <SubsectionTitle>{children}</SubsectionTitle>,
-		       ol:  ({ children }) => <ol className="list-decimal pl-6">{children}</ol>,
-		       ul:  ({ children }) => <ul className="list-disc pl-6">{children}</ul>,
-		       a:   (({ href, children }) => (
-				['/', '.'].some (e => href?.startsWith (e))
-			        ? <PrefetchLink to={href!}>{children}</PrefetchLink>
-			        : (
-				    <a href={href}
-				       target="_blank"
-				       rel="noopener noreferrer">
-				      {children}
-				    </a>))) } as const satisfies Components
 
-
-export default (({ title, body }: Props) => {
-  const { data } = useQuery ({
-      enabled: Boolean (body),
-      queryKey: wikiKeys.index ({ }),
-      queryFn: () => fetchWikiPages ({ }) })
-  const pageNames = (data ?? []).map (page => page.title).sort ((a, b) => b.length - a.length)
-
-  const remarkPlugins = useMemo (
-      () => [() => remarkWikiAutoLink (pageNames), remarkGFM], [pageNames])
-
-  return (
-      <ReactMarkdown components={mdComponents} remarkPlugins={remarkPlugins}>
-	{body || `このページは存在しません。[新規作成してください](/wiki/new?title=${ encodeURIComponent (title) })。`}
-      </ReactMarkdown>)
-}) satisfies FC<Props>
+export default (({ title, body }: Props) =>
+    <WikiMarkdown title={title} body={body ?? ''}/>) satisfies FC<Props>
diff --git a/frontend/src/components/WikiEditForm.tsx b/frontend/src/components/WikiEditForm.tsx
index 14cd4da..be64469 100644
--- a/frontend/src/components/WikiEditForm.tsx
+++ b/frontend/src/components/WikiEditForm.tsx
@@ -12,10 +12,12 @@ type Props = {
     title:    string
     body:     string
     onSubmit: (title: string, body: string) => void
-    forEdit?: boolean }
+    id?:      number | null }
 
 
-export default (({ title: initTitle, body: initBody, onSubmit, forEdit }: Props) => {
+export default (({ title: initTitle, body: initBody, onSubmit, id }: Props) => {
+  const forEdit = id != null
+
   const [title, setTitle] = useState<string> (initTitle)
   const [body, setBody] = useState<string> (initBody)
 
@@ -24,6 +26,21 @@ export default (({ title: initTitle, body: initBody, onSubmit, forEdit }: Props)
     setBody (initBody)
   }, [initTitle, initBody])
 
+  const handleImageUpload = async (file: File) => {
+    if (!(forEdit))
+      throw new Error ('画像は Wiki 作成前に追加することができません．')
+
+    const formData = new FormData
+    formData.append ('file', file)
+
+    const asset = await apiPost<WikiAsset> (
+	`/wiki/${ id }/assets`,
+	formData,
+	{ headers: { 'Content-Type': 'multipart/form-data' } })
+
+    return `{{img:${ asset.no }}}`
+  }
+
   return (
       <>
 	{/* タイトル */}
@@ -44,7 +61,8 @@ export default (({ title: initTitle, body: initBody, onSubmit, forEdit }: Props)
 	      value={body}
 	      style={{ height: '500px' }}
 	      renderHTML={text => mdParser.render (text)}
-	      onChange={({ text }) => setBody (text)}/>
+	      onChange={({ text }) => setBody (text)}
+	      onImageUpload={handleImageUpload}/>
 	</div>
 
 	{/* 送信 */}
diff --git a/frontend/src/components/WikiMarkdown.tsx b/frontend/src/components/WikiMarkdown.tsx
new file mode 100644
index 0000000..edb23e2
--- /dev/null
+++ b/frontend/src/components/WikiMarkdown.tsx
@@ -0,0 +1,77 @@
+import { useQuery } from '@tanstack/react-query'
+import { useMemo } from 'react'
+import ReactMarkdown from 'react-markdown'
+import remarkGFM from 'remark-gfm'
+
+import PrefetchLink from '@/components/PrefetchLink'
+import SectionTitle from '@/components/common/SectionTitle'
+import SubsectionTitle from '@/components/common/SubsectionTitle'
+import { wikiKeys } from '@/lib/queryKeys'
+import remarkWikiAutoLink from '@/lib/remark-wiki-autolink'
+import { fetchWikiPages } from '@/lib/wiki'
+
+import type { FC } from 'react'
+import type { Components } from 'react-markdown'
+
+type Props = {
+    title?:   string
+    body:     string
+    preview?: boolean }
+
+
+const makeComponents = (preview = false) => (
+    { h1: ({ children }) => <SectionTitle>{children}</SectionTitle>,
+      h2: ({ children }) => <SubsectionTitle>{children}</SubsectionTitle>,
+      ol: ({ children }) => <ol className="list-decimal pl-6">{children}</ol>,
+      ul: ({ children }) => <ul className="list-disc pl-6">{children}</ul>,
+      a:  ({ href, children }) => {
+	if (!(href))
+	  return <>{children}</>
+
+	if (!(preview) && ['/', '.'].some (e => href.startsWith (e)))
+	  return <PrefetchLink to={href}>{children}</PrefetchLink>
+
+	const ext = /^(?:https?:)?\/\//.test (href)
+
+	return (
+	    <a href={href}
+	       target={ext ? '_blank' : undefined}
+	       rel={ext ? 'noopener noreferrer' : undefined}>
+	      {children}
+	    </a>)
+      },
+      img: (({ src, alt }) => (
+	  <img src={src ?? ''}
+	       alt={alt ?? ''}
+	       className="max-w-full h-auto rounded"/>)),
+    } as const satisfies Components)
+
+
+export default (({ title, body, preview = false }: Props) => {
+  const { data } = useQuery ({
+      queryKey: wikiKeys.index ({ }),
+      queryFn: () => fetchWikiPages ({ }) })
+
+  const pageNames = useMemo (
+      () => (data ?? []).map ((page) => page.title).sort ((a, b) => b.length - a.length),
+      [data])
+
+  const remarkPlugins = useMemo (
+      () => [() => remarkWikiAutoLink (pageNames), remarkGFM],
+      [pageNames])
+
+  const components = useMemo (
+      () => makeComponents (preview),
+      [preview])
+
+  return (
+      <ReactMarkdown
+	  components={components}
+	  remarkPlugins={remarkPlugins}>
+        {body
+	 || (title
+	     ? ('このページは存在しません。'
+		+`[新規作成してください](/wiki/new?title=${ encodeURIComponent (title) })。`)
+	     : '')}
+      </ReactMarkdown>)
+}) satisfies FC<Props>
diff --git a/frontend/src/pages/wiki/WikiEditPage.tsx b/frontend/src/pages/wiki/WikiEditPage.tsx
index cef9c4a..75c9742 100644
--- a/frontend/src/pages/wiki/WikiEditPage.tsx
+++ b/frontend/src/pages/wiki/WikiEditPage.tsx
@@ -43,8 +43,6 @@ export default (({ user }: Props) => {
     {
       await apiPut (`/wiki/${ id }`, formData,
 		    { headers: { 'Content-Type': 'multipart/form-data' } })
-      qc.setQueryData (wikiKeys.show (title, { }),
-		       (prev: WikiPage) => ({ ...prev, title, body }))
       qc.invalidateQueries ({ queryKey: wikiKeys.root })
       toast ({ title: '投稿成功!' })
       navigate (`/wiki/${ title }`)
@@ -78,7 +76,7 @@ export default (({ user }: Props) => {
 		  title={title}
 		  body={body}
 		  onSubmit={handleSubmit}
-		  forEdit/>)}
+		  id={Number (id)}/>)}
 	</div>
       </MainArea>)
 }) satisfies FC<Props>
diff --git a/frontend/src/pages/wiki/WikiNewPage.tsx b/frontend/src/pages/wiki/WikiNewPage.tsx
index 307b1a1..38355ca 100644
--- a/frontend/src/pages/wiki/WikiNewPage.tsx
+++ b/frontend/src/pages/wiki/WikiNewPage.tsx
@@ -38,8 +38,6 @@ export default ({ user }: Props) => {
     {
       const data = await apiPost<WikiPage> ('/wiki', formData,
 	  { headers: { 'Content-Type': 'multipart/form-data' } })
-      qc.setQueryData (wikiKeys.show (data.title, { }),
-		       (prev: WikiPage) => ({ ...prev, title: data.title, body: data.body }))
       qc.invalidateQueries ({ queryKey: wikiKeys.root })
       toast ({ title: '投稿成功!' })
       navigate (`/wiki/${ data.title }`)