diff --git a/content/.README.md b/content/.README.md
index ea6e4704..a6db678e 100644
--- a/content/.README.md
+++ b/content/.README.md
@@ -37,6 +37,13 @@ VuePressでは末尾が`.md`となるパス形式でしたが、Misskey-Hub-Next
 date: 2023-11-11
 ```
 
+### `thumbnail`
+（現状ブログのみ）サムネイル画像を設定できます。URLまたはサイトディレクトリの絶対パスを入力してください
+
+```yml
+thumbnail: /img/blog/foo/bar.png
+```
+
 ### `maxTocDepth`
 （Docsのみ）もくじの見出しを遡る限度を指定できます。`<h2>`タグまでにしたい場合は`2`を指定します。
 
diff --git a/pages/blog/[slug].vue b/pages/blog/[slug].vue
index d0e09061..63293753 100644
--- a/pages/blog/[slug].vue
+++ b/pages/blog/[slug].vue
@@ -5,8 +5,8 @@
                 <LeftIco class="mr-2 stroke-1 stroke-current" />
             </GNuxtLink>
             <p class="text-center mb-4">{{ $t('_blog.title') }}</p>
-            <h1 class="text-center font-bold text-2xl lg:text-3xl mb-4">{{ data.title }}</h1>
-            <p class="text-center">{{ $d(new Date(data.date)) }}</p>
+            <h1 class="text-center font-bold text-2xl lg:text-3xl mb-4">{{ data?.title }}</h1>
+            <p class="text-center">{{ $d(new Date(data?.date)) }}</p>
         </div>
         <div class="bg-white dark:bg-slate-950 pb-12 lg:mt-12 pt-6 px-6">
             <div class="mx-auto container max-w-screen-md markdown-body">
@@ -23,6 +23,9 @@
 
 <script setup lang="ts">
 import LeftIco from 'bi/arrow-left.svg';
+import { isLocalPath } from '~/assets/js/misc';
+import { joinURL } from 'ufo';
+import type { MiBlogParsedContent } from '~/types/content';
 // 日本語でしか提供されない
 defineI18nRoute({
     locales: ['ja'],
@@ -31,7 +34,16 @@ defineI18nRoute({
 const localePath = useLocalePath();
 
 const route = useRoute();
-const { data } = await useAsyncData(`blog-${route.params.slug}`, () => queryContent(`/blog/${route.params.slug}`).findOne())
+const runtimeConfig = useRuntimeConfig();
+const { data } = await useAsyncData(`blog-${route.params.slug}`, () => queryContent<MiBlogParsedContent>(`/blog/${route.params.slug}`).findOne());
+
+if (data.value?.thumbnail) {
+    route.meta.thumbnail = isLocalPath(data.value.thumbnail) ? joinURL(runtimeConfig.public.baseUrl, data.value.thumbnail) : data.value.thumbnail;
+}
+
+if (!data.value) {
+    throw createError({ statusCode: 404, statusMessage: 'page not found' });
+}
 </script>
 
 <style scoped>
diff --git a/pages/docs/[...slug].vue b/pages/docs/[...slug].vue
index 598d816c..f1fa02ef 100644
--- a/pages/docs/[...slug].vue
+++ b/pages/docs/[...slug].vue
@@ -1,12 +1,12 @@
 <template>
     <div class="grid docs-main">
         <div class="lg:hidden sticky top-16 -mx-6 -mt-6 overflow-y-auto bg-slate-50 dark:bg-slate-900 z-[9890] border-b dark:border-slate-700 text-sm flex items-start">
-            <details v-if="data?.body && data.body.toc.links.length > 0" class="peer order-2 flex-grow flex-shrink-0" :open="openState">
+            <details v-if="data?.body && data.body.toc?.links.length > 0" class="peer order-2 flex-grow flex-shrink-0" :open="openState">
                 <summary class="py-4 cursor-pointer">
                     {{ $t('_docs._toc.title') }}
                 </summary>
                 <div class="pb-4 px-6 max-h-[65vh] overflow-y-auto">
-                    <DocsTocLinks :links="data?.body.toc.links" :max-depth="data?.maxTocDepth ?? undefined" @child-click="openState = false" />
+                    <DocsTocLinks :links="data?.body.toc?.links" :max-depth="data?.maxTocDepth ?? undefined" @child-click="openState = false" />
                 </div>
             </details>
             <button @click="isAsideNavOpen = !isAsideNavOpen" class="p-4 order-1 dark:border-slate-800 border-r peer-open:border-b mr-2">
@@ -42,6 +42,7 @@
 <script setup lang="ts">
 import AsideNavIco from 'bi/text-indent-left.svg';
 import ExtIco from 'bi/box-arrow-up-right.svg';
+import type { MiDocsParsedContent } from '~/types/content';
 
 const isAsideNavOpen = useState<boolean>('miHub_docs_asideNav_openState', () => false);
 
@@ -55,7 +56,7 @@ definePageMeta({
 const route = useRoute();
 const slugs = (route.params.slug as string[]).filter((v) => v !== '');
 
-const { data } = await useAsyncData(`docs-${locale.value}-${slugs.join('-')}`, () => queryContent(`/${locale.value}/docs/${slugs.join('/')}`).findOne());
+const { data } = await useAsyncData(`docs-${locale.value}-${slugs.join('-')}`, () => queryContent<MiDocsParsedContent>(`/${locale.value}/docs/${slugs.join('/')}`).findOne());
 
 if (!data.value) {
     throw createError({ statusCode: 404, statusMessage: 'page not found' });
diff --git a/types/content.ts b/types/content.ts
new file mode 100644
index 00000000..15f7c912
--- /dev/null
+++ b/types/content.ts
@@ -0,0 +1,29 @@
+// Misskey Docs Frontmatter Types
+import type { ParsedContent, MarkdownParsedContent } from '@nuxt/content/dist/runtime/types';
+
+/**
+ * Docs Frontmatter の型定義
+ * 
+ * `/content/<lang>/docs/` のフロントマターはこの形式で入力してください 
+ */
+export interface MiDocsParsedContent extends MarkdownParsedContent {
+    /** もくじの見出しをさかのぼる限度 */
+    maxTocDepth?: number;
+
+    /** 前へ・次へボタンの階層考慮を無視 */
+    ignoreDirBasedNav?: boolean;
+}
+
+/**
+ * Blog Frontmatter の型定義
+ * 
+ * `/content/blog/` のフロントマターはこの形式で入力してください 
+ */
+export interface MiBlogParsedContent extends MarkdownParsedContent {
+    /** サムネイル画像のURL・絶対パス */
+    thumbnail?: string;
+}
+
+/**
+ * Docs API の型定義
+ */
\ No newline at end of file
diff --git a/types/docs.ts b/types/docs.ts
deleted file mode 100644
index 0d76836f..00000000
--- a/types/docs.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-// Misskey Docs Frontmatter Types
-import type { ParsedContent, MarkdownParsedContent } from '@nuxt/content/dist/runtime/types';
-
-/**
- * Docs Frontmatter の型定義
- * 
- * `/content/<lang>/docs/` のフロントマターはこの形式で入力してください 
- */
-export interface MiDocsParsedContent extends MarkdownParsedContent {
-
-}
-
-/**
- * Docs API の型定義
- */
\ No newline at end of file