diff --git a/routes/api/v2/client/settings/nickname.ts b/routes/api/v2/client/settings/nickname.ts
index 764d0c81..ab755247 100644
--- a/routes/api/v2/client/settings/nickname.ts
+++ b/routes/api/v2/client/settings/nickname.ts
@@ -2,3 +2,44 @@
 //POST /api/v2/client/settings/nickname
 // { nickName: string, csrftoken: string }
 // -> { status: boolean, message: string }
+import takos from "../../../../../util/takos.ts";
+import users from "../../../../../models/users.ts";
+export const handler = {
+  async POST(req: Request, ctx: any) {
+    let body;
+    try {
+      body = await req.json();
+    } catch (e) {
+      return new Response(JSON.stringify({ status: false, message: "Invalid body" }), {
+        headers: { "Content-Type": "application/json" },
+        status: 400,
+      });
+    }
+    const nickName = body.nickName;
+    const csrftoken = body.csrftoken;
+    if (nickName === null || csrftoken === null) {
+      return new Response(JSON.stringify({ status: false, message: "Invalid body" }), {
+        headers: { "Content-Type": "application/json" },
+        status: 400,
+      });
+    }
+    if (typeof nickName !== "string") {
+      return new Response(JSON.stringify({ status: false, message: "Invalid nickName" }), {
+        headers: { "Content-Type": "application/json" },
+        status: 400,
+      });
+    }
+    if (await takos.checkCsrfToken(csrftoken, ctx.state.data.sessionid) === false) {
+      return new Response(JSON.stringify({ status: false, message: "Invalid csrf token" }), {
+        headers: { "Content-Type": "application/json" },
+        status: 400,
+      });
+    }
+    //nickNameを変更
+    await users.update({ nickName: nickName }, { id: ctx.state.data.userid });
+    return new Response(JSON.stringify({ status: true }), {
+      headers: { "Content-Type": "application/json" },
+      status: 200,
+    });
+  },
+};