diff --git a/src/remote/activitypub/act/delete/index.ts b/src/remote/activitypub/act/delete/index.ts
index 764814bac1..42272433de 100644
--- a/src/remote/activitypub/act/delete/index.ts
+++ b/src/remote/activitypub/act/delete/index.ts
@@ -1,18 +1,35 @@
 import Resolver from '../../resolver';
 import deleteNote from './note';
+import Post from '../../../../models/post';
 
+/**
+ * 削除アクティビティを捌きます
+ */
 export default async (actor, activity): Promise<void> => {
 	if ('actor' in activity && actor.account.uri !== activity.actor) {
-		throw new Error();
+		throw new Error('invalid actor');
 	}
 
 	const resolver = new Resolver();
 
-	const object = await resolver.resolve(activity);
+	const object = await resolver.resolve(activity.object);
+
+	const uri = (object as any).id;
 
 	switch (object.type) {
 	case 'Note':
-		deleteNote(object);
+		deleteNote(uri);
+		break;
+
+	case 'Tombstone':
+		const post = await Post.findOne({ uri });
+		if (post != null) {
+			deleteNote(uri);
+		}
+		break;
+
+	default:
+		console.warn(`Unknown type: ${object.type}`);
 		break;
 	}
 };
diff --git a/src/remote/activitypub/act/delete/note.ts b/src/remote/activitypub/act/delete/note.ts
index 3b821f87c0..75534250e6 100644
--- a/src/remote/activitypub/act/delete/note.ts
+++ b/src/remote/activitypub/act/delete/note.ts
@@ -1,8 +1,14 @@
+import * as debug from 'debug';
+
 import Post from '../../../../models/post';
 import { createDb } from '../../../../queue';
 
-export default async function(note) {
-	const post = await Post.findOneAndDelete({ uri: note.id });
+const log = debug('misskey:activitypub');
+
+export default async function(uri: string) {
+	log(`Deleting the Note: ${uri}`);
+
+	const post = await Post.findOneAndDelete({ uri });
 
 	createDb({
 		type: 'deletePostDependents',