diff --git a/src/stores/Auth.js b/src/stores/Auth.js
new file mode 100644
index 0000000..3884377
--- /dev/null
+++ b/src/stores/Auth.js
@@ -0,0 +1,11 @@
+import { makeAutoObservable } from "mobx";
+
+class Auth {
+
+  constructor(root) {
+    makeAutoObservable(this, { rootStore: false });
+    this.root = root;
+  }
+}
+
+export default Auth;
\ No newline at end of file
diff --git a/src/stores/Root.js b/src/stores/Root.js
index f369e8f..fb17968 100644
--- a/src/stores/Root.js
+++ b/src/stores/Root.js
@@ -1,9 +1,11 @@
 import { makeAutoObservable } from "mobx";
 import Plan from "./Plan";
+import Auth from "./Auth";
 
 class Root {
   constructor() {
     this.plan = new Plan(this);
+    this.auth = new Auth(this);
     makeAutoObservable(this);
   }
 }
diff --git a/src/views/Plan.jsx b/src/views/Plan.jsx
index c314b3f..f1e8cf0 100644
--- a/src/views/Plan.jsx
+++ b/src/views/Plan.jsx
@@ -79,8 +79,7 @@ const data = [
 function Plan() {
   
   const {planId} = useParams();
-  const store = useStore();
-  const planStore = store.plan;
+  const {plan} = useStore();
 
   useEffect(() => {
     console.info('planId: ' + planId);
@@ -94,8 +93,8 @@ function Plan() {
       </Col>
       
     <Col span={20}>
-    <Button onClick={() => planStore.increase()}>increase {planStore.count}</Button>
-    <Button onClick={() => planStore.decrease()}>decrease {planStore.count}</Button>
+    <Button onClick={() => plan.increase()}>increase {plan.count}</Button>
+    <Button onClick={() => plan.decrease()}>decrease {plan.count}</Button>
       </Col>
     </Row>
     <Row>