diff --git a/src/server/api/endpoints/notes/unrenote.ts b/src/server/api/endpoints/notes/unrenote.ts
new file mode 100644
index 000000000..a2070fd22
--- /dev/null
+++ b/src/server/api/endpoints/notes/unrenote.ts
@@ -0,0 +1,60 @@
+import $ from 'cafy';
+import { ID } from '../../../../misc/cafy-id';
+import deleteNote from '../../../../services/note/delete';
+import define from '../../define';
+import * as ms from 'ms';
+import { getNote } from '../../common/getters';
+import { ApiError } from '../../error';
+import { Notes } from '../../../../models';
+
+export const meta = {
+	desc: {
+		'ja-JP': '指定した投稿のRenoteを解除します。',
+	},
+
+	tags: ['notes'],
+
+	requireCredential: true,
+
+	kind: 'write:notes',
+
+	limit: {
+		duration: ms('1hour'),
+		max: 300,
+		minInterval: ms('1sec')
+	},
+
+	params: {
+		noteId: {
+			validator: $.type(ID),
+			desc: {
+				'ja-JP': '対象の投稿のID',
+				'en-US': 'Target note ID.'
+			}
+		}
+	},
+
+	errors: {
+		noSuchNote: {
+			message: 'No such note.',
+			code: 'NO_SUCH_NOTE',
+			id: 'efd4a259-2442-496b-8dd7-b255aa1a160f'
+		},
+	}
+};
+
+export default define(meta, async (ps, user) => {
+	const note = await getNote(ps.noteId).catch(e => {
+		if (e.id === '9725d0ce-ba28-4dde-95a7-2cbb2c15de24') throw new ApiError(meta.errors.noSuchNote);
+		throw e;
+	});
+
+	const renotes = await Notes.find({
+		userId: user.id,
+		renoteId: note.id
+	});
+
+	for (const note of renotes) {
+		deleteNote(user, note);
+	}
+});