diff --git a/api/auth/index.js b/api/auth/index.js
index 9b65f2c..5f6ace5 100644
--- a/api/auth/index.js
+++ b/api/auth/index.js
@@ -10,19 +10,17 @@ const postSignInFailResponseData = {
   signIn: false,
 };
 
-export const postSignIn = (userId, userPw) => {
-  if (userId === 'admin' && userPw === '1234') {
-    return fetch.post(
-      `fakeFetch.com/signin`,
-      { userId, userPw },
-      postSignInSuccessResponseData,
-    );
+export const postSignIn = aUser => {
+  let res = postSignInFailResponseData;
+
+  if (aUser.userId === 'admin' && aUser.userPw === '1234') {
+    res = postSignInSuccessResponseData;
   }
 
   return fetch.post(
     `fakeFetch.com/signin`,
-    { userId, userPw },
-    postSignInFailResponseData,
+    { userId: aUser.userId, userPw: aUser.userPw },
+    res,
   );
 };
 
@@ -31,6 +29,10 @@ const postSignOutSuccessResponseData = {
   signOut: true,
 };
 
-export const postSignOut = () => {
-  return fetch.post(`fakeFetch.com/signout`, postSignOutSuccessResponseData);
+export const postSignOut = aUser => {
+  return fetch.post(
+    `fakeFetch.com/signout`,
+    { userId: aUser.userId },
+    postSignOutSuccessResponseData,
+  );
 };
diff --git a/helpers/auth/index.js b/helpers/auth/index.js
index c201b53..3d69d09 100644
--- a/helpers/auth/index.js
+++ b/helpers/auth/index.js
@@ -1,26 +1,35 @@
 import * as authApi from '../../api/auth';
 
+import User from '../../objects/User';
+
 let stateSignIn = false;
-let userId = '';
+let user = new User();
+
+const initState = () => {
+  stateSignIn = false;
+  user = new User();
+};
+
+const setState = aUser => {
+  stateSignIn = true;
+  user = aUser;
+};
 
 export const signIn = async (intputUserId, inputUserPw) => {
-  const response = await authApi.postSignIn(intputUserId, inputUserPw);
+  // 암호화 필요
+  const cryptoPw = inputUserPw;
+  const inputUser = new User({ userId: intputUserId, userPw: cryptoPw });
+  const response = await authApi.postSignIn(inputUser);
 
-  if (response.signIn) {
-    stateSignIn = true;
-    userId = intputUserId;
-  }
+  if (response.signIn) setState();
 
   return stateSignIn;
 };
 
 export const signOut = async () => {
-  const response = await authApi.postSignIn(userId);
+  const response = await authApi.postSignIn(user);
 
-  if (response.signOut) {
-    stateSignIn = false;
-    userId = '';
-  }
+  if (response.signOut) initState();
 
   return !stateSignIn;
 };
diff --git a/objects/User.js b/objects/User.js
new file mode 100644
index 0000000..1eef92a
--- /dev/null
+++ b/objects/User.js
@@ -0,0 +1,17 @@
+class User {
+  constructor(aUser) {
+    if (!aUser) return;
+    this._userId = aUser.userId || '';
+    this._userPw = aUser.userPw || '';
+  }
+
+  get userId() {
+    return this._userId;
+  }
+
+  get userPw() {
+    return this._userPw;
+  }
+}
+
+export default User;