diff --git a/frontend/src/components/WikiBody.tsx b/frontend/src/components/WikiBody.tsx
index 187b52e..e041398 100644
--- a/frontend/src/components/WikiBody.tsx
+++ b/frontend/src/components/WikiBody.tsx
@@ -4,13 +4,31 @@ import { useEffect, useState } from 'react'
 import ReactMarkdown from 'react-markdown'
 import { Link } from 'react-router-dom'
 
+import SectionTitle from '@/components/common/SectionTitle'
+import SubsectionTitle from '@/components/common/SubsectionTitle'
 import { API_BASE_URL } from '@/config'
 
+import type { Components } from 'react-markdown'
+
 import type { WikiPage } from '@/types'
 
 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))
+			        ? <Link to={href!}>{children}</Link>
+			        : (
+				    <a href={href}
+				       target="_blank"
+				       rel="noopener noreferrer">
+				      {children}
+				    </a>))) } as const satisfies Components
+
 
 export default ({ title, body }: Props) => {
   const [pageNames, setPageNames] = useState<string[]> ([])
@@ -79,10 +97,7 @@ export default ({ title, body }: Props) => {
   }, [body, pageNames])
 
   return (
-      <ReactMarkdown components={{ a: (
-	  ({ href, children }) => (['/', '.'].some (e => href?.startsWith (e))
-				   ? <Link to={href!}>{children}</Link>
-				   : <a href={href} target="_blank" rel="noopener noreferrer">{children}</a>)) }}>
+      <ReactMarkdown components={mdComponents}>
 	{realBody || `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=${ encodeURIComponent (title) })。`}
       </ReactMarkdown>)
 }
diff --git a/frontend/src/pages/posts/PostListPage.tsx b/frontend/src/pages/posts/PostListPage.tsx
index 95003b5..f1cdbed 100644
--- a/frontend/src/pages/posts/PostListPage.tsx
+++ b/frontend/src/pages/posts/PostListPage.tsx
@@ -131,7 +131,7 @@ export default () => {
 	    </Tab>
 	    {tags.length === 1 && (
 		<Tab name="Wiki">
-		  <WikiBody body={wikiPage?.body} title={tags[0]} />
+		  <WikiBody title={tags[0]} body={wikiPage?.body} />
 		  <div className="my-2">
 		    <Link to={`/wiki/${ encodeURIComponent (tags[0]) }`}>
 		      Wiki を見る
diff --git a/frontend/src/pages/wiki/WikiDetailPage.tsx b/frontend/src/pages/wiki/WikiDetailPage.tsx
index be69f59..dbf1e5d 100644
--- a/frontend/src/pages/wiki/WikiDetailPage.tsx
+++ b/frontend/src/pages/wiki/WikiDetailPage.tsx
@@ -60,6 +60,7 @@ export default () => {
       }
     }) ()
 
+    setPosts ([])
     void (async () => {
       try
       {
@@ -73,7 +74,7 @@ export default () => {
       }
       catch
       {
-	setPosts ([])
+	;
       }
     }) ()
 
@@ -123,7 +124,7 @@ export default () => {
 	<div className="prose mx-auto p-4">
 	  {wikiPage === undefined
 	   ? 'Loading...'
-	   : <WikiBody body={wikiPage?.body} title={title} />}
+	   : <WikiBody title={title} body={wikiPage?.body} />}
 	</div>
 
 	{(!(version) && posts.length > 0) && (