diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index 4860ef3e12..5ebec4ffd0 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -42,13 +42,26 @@ import { MetaEntityService } from '@/core/entities/MetaEntityService.js';
 import { GalleryPostEntityService } from '@/core/entities/GalleryPostEntityService.js';
 import { ClipEntityService } from '@/core/entities/ClipEntityService.js';
 import { ChannelEntityService } from '@/core/entities/ChannelEntityService.js';
-import type { ChannelsRepository, ClipsRepository, FlashsRepository, GalleryPostsRepository, MiMeta, NotesRepository, PagesRepository, ReversiGamesRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
+import type {
+	AnnouncementsRepository,
+	ChannelsRepository,
+	ClipsRepository,
+	FlashsRepository,
+	GalleryPostsRepository,
+	MiMeta,
+	NotesRepository,
+	PagesRepository,
+	ReversiGamesRepository,
+	UserProfilesRepository,
+	UsersRepository,
+} from '@/models/_.js';
 import type Logger from '@/logger.js';
 import { handleRequestRedirectToOmitSearch } from '@/misc/fastify-hook-handlers.js';
 import { bindThis } from '@/decorators.js';
 import { FlashEntityService } from '@/core/entities/FlashEntityService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { ReversiGameEntityService } from '@/core/entities/ReversiGameEntityService.js';
+import { AnnouncementEntityService } from '@/core/entities/AnnouncementEntityService.js';
 import { FeedService } from './FeedService.js';
 import { UrlPreviewService } from './UrlPreviewService.js';
 import { ClientLoggerService } from './ClientLoggerService.js';
@@ -103,6 +116,9 @@ export class ClientServerService {
 		@Inject(DI.reversiGamesRepository)
 		private reversiGamesRepository: ReversiGamesRepository,
 
+		@Inject(DI.announcementsRepository)
+		private announcementsRepository: AnnouncementsRepository,
+
 		private flashEntityService: FlashEntityService,
 		private userEntityService: UserEntityService,
 		private noteEntityService: NoteEntityService,
@@ -112,6 +128,7 @@ export class ClientServerService {
 		private clipEntityService: ClipEntityService,
 		private channelEntityService: ChannelEntityService,
 		private reversiGameEntityService: ReversiGameEntityService,
+		private announcementEntityService: AnnouncementEntityService,
 		private urlPreviewService: UrlPreviewService,
 		private feedService: FeedService,
 		private roleService: RoleService,
@@ -776,6 +793,24 @@ export class ClientServerService {
 				return await renderBase(reply);
 			}
 		});
+
+		// 個別お知らせページ
+		fastify.get<{ Params: { announcementId: string; } }>('/announcements/:announcementId', async (request, reply) => {
+			const announcement = await this.announcementsRepository.findOneBy({
+				id: request.params.announcementId,
+			});
+
+			if (announcement) {
+				const _announcement = await this.announcementEntityService.pack(announcement);
+				reply.header('Cache-Control', 'public, max-age=3600');
+				return await reply.view('announcement', {
+					announcement: _announcement,
+					...await this.generateCommonPugData(this.meta),
+				});
+			} else {
+				return await renderBase(reply);
+			}
+		});
 		//#endregion
 
 		//#region noindex pages
diff --git a/packages/backend/src/server/web/views/announcement.pug b/packages/backend/src/server/web/views/announcement.pug
new file mode 100644
index 0000000000..7a4052e8a4
--- /dev/null
+++ b/packages/backend/src/server/web/views/announcement.pug
@@ -0,0 +1,21 @@
+extends ./base
+
+block vars
+	- const title = announcement.title;
+	- const description = announcement.text.length > 100 ? announcement.text.slice(0, 100) + '…' : announcement.text;
+	- const url = `${config.url}/announcements/${announcement.id}`;
+
+block title
+	= `${title} | ${instanceName}`
+
+block desc
+	meta(name='description' content=description)
+
+block og
+	meta(property='og:type'        content='article')
+	meta(property='og:title'       content= title)
+	meta(property='og:description' content= description)
+	meta(property='og:url'         content= url)
+	if announcement.imageUrl
+		meta(property='og:image' content=announcement.imageUrl)
+		meta(property='twitter:card' content='summary_large_image')
diff --git a/packages/backend/src/server/web/views/base.pug b/packages/backend/src/server/web/views/base.pug
index 88714b2556..280a5923c2 100644
--- a/packages/backend/src/server/web/views/base.pug
+++ b/packages/backend/src/server/web/views/base.pug
@@ -2,6 +2,7 @@ block vars
 
 block loadClientEntry
 	- const entry = config.frontendEntry;
+	- const baseUrl = config.url;
 
 doctype html
 
@@ -32,7 +33,7 @@ html
 		link(rel='icon' href= icon || '/favicon.ico')
 		link(rel='apple-touch-icon' href= appleTouchIcon || '/apple-touch-icon.png')
 		link(rel='manifest' href='/manifest.json')
-		link(rel='search' type='application/opensearchdescription+xml' title=(title || "Misskey") href=`${url}/opensearch.xml`)
+		link(rel='search' type='application/opensearchdescription+xml' title=(title || "Misskey") href=`${baseUrl}/opensearch.xml`)
 		link(rel='prefetch' href=serverErrorImageUrl)
 		link(rel='prefetch' href=infoImageUrl)
 		link(rel='prefetch' href=notFoundImageUrl)
diff --git a/packages/frontend/src/pages/announcement.vue b/packages/frontend/src/pages/announcement.vue
index 01c29cf02d..56c10fb292 100644
--- a/packages/frontend/src/pages/announcement.vue
+++ b/packages/frontend/src/pages/announcement.vue
@@ -103,7 +103,7 @@ const headerActions = computed(() => []);
 const headerTabs = computed(() => []);
 
 definePageMetadata(() => ({
-	title: announcement.value ? `${i18n.ts.announcements}: ${announcement.value.title}` : i18n.ts.announcements,
+	title: announcement.value ? announcement.value.title : i18n.ts.announcements,
 	icon: 'ti ti-speakerphone',
 }));
 </script>