diff --git a/locales/ja.yml b/locales/ja.yml
index 08e437fbf7..9c3daf450f 100644
--- a/locales/ja.yml
+++ b/locales/ja.yml
@@ -915,6 +915,11 @@ desktop/views/pages/admin/admin.suspend-user.vue:
   suspend: "凍結"
   suspended: "凍結しました"
 
+desktop/views/pages/admin/admin.unsuspend-user.vue:
+  unsuspend-user: "ユーザーの凍結の解除"
+  unsuspend: "凍結の解除"
+  unsuspended: "凍結を解除しました"
+
 desktop/views/pages/deck/deck.tl-column.vue:
   is-media-only: "メディア投稿のみ"
   is-media-view: "メディアビュー"
diff --git a/src/client/app/desktop/views/pages/admin/admin.unsuspend-user.vue b/src/client/app/desktop/views/pages/admin/admin.unsuspend-user.vue
new file mode 100644
index 0000000000..8c6f63ce88
--- /dev/null
+++ b/src/client/app/desktop/views/pages/admin/admin.unsuspend-user.vue
@@ -0,0 +1,51 @@
+<template>
+<div>
+	<header>%i18n:@unsuspend-user%</header>
+	<input v-model="username" type="text" class="ui"/>
+	<button class="ui" @click="unsuspendUser" :disabled="unsuspending">%i18n:@unsuspend%</button>
+</div>
+</template>
+
+<script lang="ts">
+import Vue from "vue";
+import parseAcct from "../../../../../../misc/acct/parse";
+
+export default Vue.extend({
+	data() {
+		return {
+			username: null,
+			unsuspending: false
+		};
+	},
+	methods: {
+		async unsuspendUser() {
+			this.unsuspending = true;
+
+			const user = await (this as any).os.api(
+				"users/show",
+				parseAcct(this.username)
+			);
+
+			await (this as any).os.api("admin/unsuspend-user", {
+				userId: user.id
+			});
+
+			this.unsuspending = false;
+
+			(this as any).os.apis.dialog({ text: "%i18n:@unsuspended%" });
+		}
+	}
+});
+</script>
+
+<style lang="stylus" scoped>
+@import '~const.styl'
+
+header
+	margin 10px 0
+
+
+button
+	margin 16px 0
+
+</style>
diff --git a/src/client/app/desktop/views/pages/admin/admin.vue b/src/client/app/desktop/views/pages/admin/admin.vue
index 12858cc6d0..b581bea465 100644
--- a/src/client/app/desktop/views/pages/admin/admin.vue
+++ b/src/client/app/desktop/views/pages/admin/admin.vue
@@ -14,6 +14,7 @@
 		</div>
 		<div v-if="page == 'users'">
 			<x-suspend-user/>
+			<x-unsuspend-user/>
 		</div>
 		<div v-if="page == 'drive'"></div>
 		<div v-if="page == 'update'"></div>
@@ -25,11 +26,13 @@
 import Vue from "vue";
 import XDashboard from "./admin.dashboard.vue";
 import XSuspendUser from "./admin.suspend-user.vue";
+import XUnsuspendUser from "./admin.unsuspend-user.vue";
 
 export default Vue.extend({
 	components: {
 		XDashboard,
-		XSuspendUser
+		XSuspendUser,
+		XUnsuspendUser
 	},
 	data() {
 		return {
diff --git a/src/server/api/endpoints/admin/unsuspend-user.ts b/src/server/api/endpoints/admin/unsuspend-user.ts
new file mode 100644
index 0000000000..8409bd1b76
--- /dev/null
+++ b/src/server/api/endpoints/admin/unsuspend-user.ts
@@ -0,0 +1,46 @@
+import $ from 'cafy';
+import ID from '../../../../misc/cafy-id';
+import getParams from '../../get-params';
+import User from '../../../../models/user';
+
+export const meta = {
+	desc: {
+		ja: '指定したユーザーの凍結を解除します。',
+		en: 'Unsuspend a user.'
+	},
+
+	requireCredential: true,
+	requireAdmin: true,
+
+	params: {
+		userId: $.type(ID).note({
+			desc: {
+				ja: '対象のユーザーID',
+				en: 'The user ID which you want to unsuspend'
+			}
+		}),
+	}
+};
+
+export default (params: any) => new Promise(async (res, rej) => {
+	const [ps, psErr] = getParams(meta, params);
+	if (psErr) return rej(psErr);
+
+	const user = await User.findOne({
+		_id: ps.userId
+	});
+
+	if (user == null) {
+		return rej('user not found');
+	}
+
+	await User.findOneAndUpdate({
+		_id: user._id
+	}, {
+			$set: {
+				isSuspended: false
+			}
+		});
+
+	res();
+});