diff --git a/README.md b/README.md
index aae947575dab..f67ae510b141 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@
 - 新着ノート通知があった時まとめるように https://github.com/team-shahu/misskey/pull/40
 - いいねボタンの実装 https://github.com/team-shahu/misskey/pull/41 https://github.com/team-shahu/misskey/pull/44 https://github.com/team-shahu/misskey/pull/45
 - 独自機能ページの追加 https://github.com/team-shahu/misskey/pull/42
-- 予約投稿機能 https://github.com/team-shahu/misskey/pull/46
+- 予約投稿機能 https://github.com/team-shahu/misskey/pull/46 https://github.com/team-shahu/misskey/pull/49 https://github.com/team-shahu/misskey/pull/51
 - フォロー/フォロリクの履歴 https://github.com/team-shahu/misskey/pull/49 https://github.com/team-shahu/misskey/pull/50
 
 ## Special Thanks
diff --git a/packages/backend/src/models/NoteSchedule.ts b/packages/backend/src/models/NoteSchedule.ts
index dde0af6ad763..bb6cb4d7f39c 100644
--- a/packages/backend/src/models/NoteSchedule.ts
+++ b/packages/backend/src/models/NoteSchedule.ts
@@ -37,6 +37,7 @@ export type MiScheduleNoteType={
 	apMentions?: MinimumUser[] | null;
 	apHashtags?: string[] | null;
 	apEmojis?: string[] | null;
+	deleteAt?: string | null;
 }
 
 @Entity('note_schedule')
diff --git a/packages/backend/src/queue/processors/ScheduleNotePostProcessorService.ts b/packages/backend/src/queue/processors/ScheduleNotePostProcessorService.ts
index f281b0ed7bc2..8ec14ed11a41 100644
--- a/packages/backend/src/queue/processors/ScheduleNotePostProcessorService.ts
+++ b/packages/backend/src/queue/processors/ScheduleNotePostProcessorService.ts
@@ -119,6 +119,7 @@ export class ScheduleNotePostProcessorService {
 					reply,
 					renote,
 					channel,
+					deleteAt: note.deleteAt ? new Date(note.deleteAt) : null,
 				});
 				await this.noteScheduleRepository.remove(data);
 				this.notificationService.createNotification(me.id, 'scheduledNotePosted', {
diff --git a/packages/backend/src/server/api/endpoints/notes/schedule/create.ts b/packages/backend/src/server/api/endpoints/notes/schedule/create.ts
index 520837ce94d2..9018e6c75705 100644
--- a/packages/backend/src/server/api/endpoints/notes/schedule/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/schedule/create.ts
@@ -117,6 +117,18 @@ export const meta = {
 			code: 'CANNOT_RENOTE_OUTSIDE_OF_CHANNEL',
 			id: '33510210-8452-094c-6227-4a6c05d99f00',
 		},
+
+		cannotScheduleDeleteEarlierThanNow: {
+			message: 'Scheduled delete time is earlier than now.',
+			code: 'CANNOT_SCHEDULE_DELETE_EARLIER_THAN_NOW',
+			id: '9576c3c8-d8f3-11ee-ac15-00155d19d35d',
+		},
+
+		cannotScheduleDeleteLaterThanOneYear: {
+			message: 'Scheduled delete time is later than one year.',
+			code: 'CANNOT_SCHEDULE_DELETE_LATER_THAN_ONE_YEAR',
+			id: 'b02b5edb-2741-4841-b692-d9893f1e6515',
+		},
 	},
 } as const;
 
@@ -181,6 +193,14 @@ export const paramDef = {
 				scheduledAt: { type: 'integer', nullable: false },
 			},
 		},
+		scheduledDelete: {
+			type: 'object',
+			nullable: true,
+			properties: {
+				deleteAt: { type: 'number', nullable: true },
+				deleteAfter: { type: 'number', nullable: true },
+			},
+		},
 	},
 	// (re)note with text, files and poll are optional
 	anyOf: [
@@ -326,6 +346,21 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			} else {
 				throw new ApiError(meta.errors.cannotCreateAlreadyExpiredSchedule);
 			}
+
+			if (ps.scheduledDelete) {
+				if (typeof ps.scheduledDelete.deleteAt === 'number') {
+					if (ps.scheduledDelete.deleteAt < Date.now()) {
+						throw new ApiError(meta.errors.cannotScheduleDeleteEarlierThanNow);
+					}
+				} else if (typeof ps.scheduledDelete.deleteAfter === 'number') {
+					ps.scheduledDelete.deleteAt = ps.scheduleNote.scheduledAt + ps.scheduledDelete.deleteAfter;
+				}
+
+				if (ps.scheduledDelete.deleteAt && ps.scheduledDelete.deleteAt > ps.scheduleNote.scheduledAt + ms('1year')) {
+					throw new ApiError(meta.errors.cannotScheduleDeleteLaterThanOneYear);
+				}
+			}
+
 			const note: MiScheduleNoteType = {
 				files: files.map(f => f.id),
 				poll: ps.poll ? {
@@ -344,6 +379,9 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				apMentions: ps.noExtractMentions ? [] : undefined,
 				apHashtags: ps.noExtractHashtags ? [] : undefined,
 				apEmojis: ps.noExtractEmojis ? [] : undefined,
+				deleteAt: ps.scheduledDelete && ps.scheduledDelete.deleteAt
+					? new Date(ps.scheduledDelete.deleteAt).toISOString()
+					: null,
 			};
 
 			if (ps.scheduleNote.scheduledAt) {