diff --git a/src/client/app/desktop/views/components/post-form.vue b/src/client/app/desktop/views/components/post-form.vue
index 0e86bbf9f..de3e815b8 100644
--- a/src/client/app/desktop/views/components/post-form.vue
+++ b/src/client/app/desktop/views/components/post-form.vue
@@ -74,6 +74,7 @@ import { host } from '../../../config';
 import { erase, unique } from '../../../../../prelude/array';
 import { length } from 'stringz';
 import { toASCII } from 'punycode';
+import extractMentions from '../../../../../misc/extract-mentions';
 
 export default Vue.extend({
 	i18n: i18n('desktop/views/components/post-form.vue'),
@@ -184,8 +185,7 @@ export default Vue.extend({
 		if (this.reply && this.reply.text != null) {
 			const ast = parse(this.reply.text);
 
-			// TODO: 新しいMFMパーサに対応
-			for (const x of ast.filter(t => t.type == 'mention')) {
+			for (const x of extractMentions(ast)) {
 				const mention = x.host ? `@${x.username}@${toASCII(x.host)}` : `@${x.username}`;
 
 				// 自分は除外
diff --git a/src/client/app/mobile/views/components/post-form.vue b/src/client/app/mobile/views/components/post-form.vue
index d9cf1471c..e35a64764 100644
--- a/src/client/app/mobile/views/components/post-form.vue
+++ b/src/client/app/mobile/views/components/post-form.vue
@@ -66,6 +66,7 @@ import { host } from '../../../config';
 import { erase, unique } from '../../../../../prelude/array';
 import { length } from 'stringz';
 import { toASCII } from 'punycode';
+import extractMentions from '../../../../../misc/extract-mentions';
 
 export default Vue.extend({
 	i18n: i18n('mobile/views/components/post-form.vue'),
@@ -174,7 +175,7 @@ export default Vue.extend({
 		if (this.reply && this.reply.text != null) {
 			const ast = parse(this.reply.text);
 
-			for (const x of ast.filter(t => t.type == 'mention')) {
+			for (const x of extractMentions(ast)) {
 				const mention = x.host ? `@${x.username}@${toASCII(x.host)}` : `@${x.username}`;
 
 				// 自分は除外
diff --git a/src/mfm/parser.ts b/src/mfm/parser.ts
index 6980b36ea..56c49ba3f 100644
--- a/src/mfm/parser.ts
+++ b/src/mfm/parser.ts
@@ -11,6 +11,15 @@ export type Node = {
 	props?: any;
 };
 
+export interface IMentionNode extends Node {
+	props: {
+		canonical: string;
+		username: string;
+		host: string;
+		acct: string;
+	};
+}
+
 function _makeNode(name: string, children?: Node[], props?: any): Node {
 	return children ? {
 		name,
diff --git a/src/misc/extract-mentions.ts b/src/misc/extract-mentions.ts
new file mode 100644
index 000000000..1d844211c
--- /dev/null
+++ b/src/misc/extract-mentions.ts
@@ -0,0 +1,19 @@
+import parse from '../mfm/parse';
+import { Node, IMentionNode } from '../mfm/parser';
+
+export default function(tokens: ReturnType<typeof parse>): IMentionNode['props'][] {
+	const mentions: IMentionNode['props'][] = [];
+
+	const extract = (tokens: Node[]) => {
+		for (const x of tokens.filter(x => x.name === 'mention')) {
+			mentions.push(x.props);
+		}
+		for (const x of tokens.filter(x => x.children)) {
+			extract(x.children);
+		}
+	};
+
+	extract(tokens);
+
+	return mentions;
+}
diff --git a/src/services/note/create.ts b/src/services/note/create.ts
index eef36505a..75d9521bd 100644
--- a/src/services/note/create.ts
+++ b/src/services/note/create.ts
@@ -29,6 +29,7 @@ import insertNoteUnread from './unread';
 import registerInstance from '../register-instance';
 import Instance from '../../models/instance';
 import { Node } from '../../mfm/parser';
+import extractMentions from '../../misc/extract-mentions';
 
 type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';
 
@@ -665,19 +666,7 @@ function incNotesCount(user: IUser) {
 async function extractMentionedUsers(user: IUser, tokens: ReturnType<typeof parse>): Promise<IUser[]> {
 	if (tokens == null) return [];
 
-	const mentions: any[] = [];
-
-	const extract = (tokens: Node[]) => {
-		for (const x of tokens.filter(x => x.name === 'mention')) {
-			mentions.push(x.props);
-		}
-		for (const x of tokens.filter(x => x.children)) {
-			extract(x.children);
-		}
-	};
-
-	// Extract hashtags
-	extract(tokens);
+	const mentions = extractMentions(tokens);
 
 	let mentionedUsers =
 		erase(null, await Promise.all(mentions.map(async m => {