diff --git a/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java b/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
index c4c6944..a570877 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
@@ -1,9 +1,82 @@
 package org.ntlab.acanthus_client;
 
 import android.app.Application;
+import android.content.SharedPreferences;
 
+import org.ntlab.acanthus_client.entities.Account;
+
+//-----------------------------------------------------------------
+// ユーザーアカウント
 public class Acanthus extends Application {
-    private String password;
+    private Integer uid;
+    private String name;
     private String email;
+    private String password;
+    private String token;
 
+    //-----------------------------------------------------------------
+    // setter
+    public String getName() {
+        if(name == null){
+            SharedPreferences preferences = getSharedPreferences("prefData",MODE_PRIVATE);
+            name = preferences.getString("name", "");
+        }
+        return name;
+    }
+
+    public String getEmail() {
+        if(email == null){
+            SharedPreferences preferences = getSharedPreferences("prefData",MODE_PRIVATE);
+            email = preferences.getString("name", "");
+        }
+        return email;
+    }
+
+    public String getPassword() {
+        if(password == null){
+            SharedPreferences preferences = getSharedPreferences("prefData",MODE_PRIVATE);
+            password = preferences.getString("name", "");
+        }
+        return password;
+    }
+
+    public String getToken() {
+        if(token == null){
+            SharedPreferences preferences = getSharedPreferences("prefData",MODE_PRIVATE);
+            token = preferences.getString("name", "");
+        }
+        return token;
+    }
+
+    //-----------------------------------------------------------------
+    // setter
+    public void setName(String name){
+        SharedPreferences preferences = getSharedPreferences("prefData", MODE_PRIVATE);
+        SharedPreferences.Editor editor = preferences.edit();
+        editor.putString("name", this.name);
+        editor.commit();
+    }
+
+    public void setEmail(String email) {
+        SharedPreferences preferences = getSharedPreferences("prefData", MODE_PRIVATE);
+        SharedPreferences.Editor editor = preferences.edit();
+        editor.putString("email", this.email);
+        editor.commit();
+    }
+
+    public void setPassword(String password){
+        SharedPreferences preferences = getSharedPreferences("prefData", MODE_PRIVATE);
+        SharedPreferences.Editor editor = preferences.edit();
+        editor.putString("password", this.password);
+        editor.commit();
+    }
+
+    public void setToken(String token){
+        SharedPreferences preferences = getSharedPreferences("prefData", MODE_PRIVATE);
+        SharedPreferences.Editor editor = preferences.edit();
+        editor.putString("token", this.token);
+        editor.commit();
+    }
+
+    //-----------------------------------------------------------------
 }
diff --git a/app/src/main/java/org/ntlab/acanthus_client/entities/Account.java b/app/src/main/java/org/ntlab/acanthus_client/entities/Account.java
index 7bec5e5..944e309 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/entities/Account.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/entities/Account.java
@@ -1,12 +1,17 @@
 package org.ntlab.acanthus_client.entities;
 
+import android.os.Build;
+import android.preference.PreferenceDataStore;
+
+import androidx.annotation.RequiresApi;
+
 import java.time.LocalDateTime;
 import java.util.HashMap;
 import java.util.UUID;
 
 //-----------------------------------------------------------------
 // ユーザーアカウント
-public class Account {
+public class Account{
     private Integer uid;
     private String name;
     private String email;
diff --git a/app/src/main/java/org/ntlab/acanthus_client/views/Login/LoginScreenActivity.java b/app/src/main/java/org/ntlab/acanthus_client/views/Login/LoginScreenActivity.java
index 6154b1d..e2407e4 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/views/Login/LoginScreenActivity.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/views/Login/LoginScreenActivity.java
@@ -1,14 +1,20 @@
 package org.ntlab.acanthus_client.views.Login;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.navigation.ActivityNavigator;
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;
 
+import org.ntlab.acanthus_client.Acanthus;
 import org.ntlab.acanthus_client.R;
+import org.ntlab.acanthus_client.databinding.ActivityLoginScreenBinding;
 import org.ntlab.acanthus_client.entities.AccountTokenJson;
 import org.ntlab.acanthus_client.resources.accounts.AccountsRest;
 import org.ntlab.acanthus_client.views.MainActivity;
@@ -28,93 +34,56 @@
 public class LoginScreenActivity extends AppCompatActivity {
 
     //-----------------------------------------------------------------
-    // 各Viewの列挙型
-    public enum EditTexts {
-        emailForm(0), passwordForm(1), loginButton(2), redoSignUpButton(3);
+    private LoginScreenViewModel loginScreenViewModel;
+    private ActivityLoginScreenBinding binding;
 
-        private int textId;
 
-        //-----------------------------------------------------------------
-        private EditTexts(int textId) {
-            this.textId = textId;
-        }
-
-        //-----------------------------------------------------------------
-        // getter
-        public int getTextId() {
-            return this.textId;
-        }
+    //-----------------------------------------------------------------
+    // ログインボタン押下時の処理
+    public void onClickLogin(View view) {
+        Acanthus acanthus = (Acanthus) getApplication();
+        loginScreenViewModel.issueLoginToken(
+                acanthus, binding.editTextTextLoginEmail, binding.editTextTextLoginPassword);
     }
 
     //-----------------------------------------------------------------
-    private ArrayList<TextView> views = new ArrayList<>();
+    // サインアップを押下
+    public void onClickSignUp(View view) {
+        transitionActivity(new SignUpActivity());
+    }
 
     //-----------------------------------------------------------------
+    //-----------------------------------------------------------------
     //
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        init();
+    }
+
+    //-----------------------------------------------------------------
+    //-----------------------------------------------------------------
+    // 初期化
+    private void init() {
         setContentView(R.layout.activity_login_screen);
-        initView();
+        binding = ActivityLoginScreenBinding.inflate(getLayoutInflater());
 
-        Retrofit retrofit = new Retrofit.Builder()
-                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/acanthus/")
-                .addConverterFactory(JacksonConverterFactory.create())
-                .build();
-        final AccountsRest accountsRest = retrofit.create(AccountsRest.class);
-
-        onClickLogin(accountsRest);
-        onClickSignUp();
-
+        startObserve();
     }
 
     //-----------------------------------------------------------------
-    // ログインボタン押下時の処理
-    private void onClickLogin(AccountsRest accountsRest) {
-        Button loginButton = (Button) views.get(EditTexts.loginButton.getTextId());
-
-        loginButton.setOnClickListener(v -> {
-            String emailAddress = views.get(EditTexts.emailForm.getTextId()).getText().toString();
-            String password = views.get(EditTexts.passwordForm.getTextId()).getText().toString();
-
-            // ログイン
-            Call<AccountTokenJson> call = accountsRest.issueLoginToken(emailAddress, password);
-            call.enqueue(new Callback<AccountTokenJson>() {
-                @Override
-                public void onResponse(Call<AccountTokenJson> call, Response<AccountTokenJson> response) {
-                    if (response.isSuccessful()) succeedLogin();
-                    else loginButton.setText("Faild");
-                }
-
-                @Override
-                public void onFailure(Call<AccountTokenJson> call, Throwable t) {
-                    loginButton.setText("failure");
-                }
-            });
+    // VMの監視開始
+    private void startObserve() {
+        loginScreenViewModel = new ViewModelProvider(this).get(LoginScreenViewModel.class);
+        loginScreenViewModel.getAcanthus().observe(this, new Observer<Acanthus>() {
+            @Override
+            public void onChanged(Acanthus acanthus) {
+                succeedLogin();
+            }
         });
     }
 
     //-----------------------------------------------------------------
-    // サインアップ画面に遷移
-    private void onClickSignUp() {
-        Button signUpButton = (Button) views.get(EditTexts.redoSignUpButton.getTextId());
-
-        signUpButton.setOnClickListener(v -> {
-            transitionActivity(new SignUpActivity());
-        });
-    }
-
-    //-----------------------------------------------------------------
-    //-----------------------------------------------------------------
-    //
-    private void initView() {
-        views.add(findViewById(R.id.editTextTextLoginEmail));
-        views.add(findViewById(R.id.editTextTextLoginPassword));
-        views.add(findViewById(R.id.buttonLoginLogin));
-        views.add(findViewById(R.id.buttonRedoSignUp));
-    }
-
-    //-----------------------------------------------------------------
     // ログイン成功時の処理
     private void succeedLogin() {
         transitionActivity(new MainActivity());
diff --git a/app/src/main/java/org/ntlab/acanthus_client/views/Login/LoginScreenViewModel.java b/app/src/main/java/org/ntlab/acanthus_client/views/Login/LoginScreenViewModel.java
new file mode 100644
index 0000000..31885b6
--- /dev/null
+++ b/app/src/main/java/org/ntlab/acanthus_client/views/Login/LoginScreenViewModel.java
@@ -0,0 +1,77 @@
+package org.ntlab.acanthus_client.views.Login;
+
+import android.accounts.AccountAuthenticatorActivity;
+import android.widget.EditText;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import org.ntlab.acanthus_client.Acanthus;
+import org.ntlab.acanthus_client.entities.AccountTokenJson;
+import org.ntlab.acanthus_client.resources.accounts.AccountsRest;
+import org.ntlab.acanthus_client.views.MainActivity;
+
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+import retrofit2.Retrofit;
+import retrofit2.converter.jackson.JacksonConverterFactory;
+
+//-----------------------------------------------------------------
+//
+public class LoginScreenViewModel extends ViewModel {
+
+    private MutableLiveData<Acanthus> acanthusMutableLiveData;
+
+    //-----------------------------------------------------------------
+    //-----------------------------------------------------------------
+    //
+    public LoginScreenViewModel() {
+        this.acanthusMutableLiveData = new MutableLiveData<>();
+    }
+
+    //-----------------------------------------------------------------
+    // getter
+    public LiveData<Acanthus> getAcanthus() {
+        return this.acanthusMutableLiveData;
+    }
+
+    //-----------------------------------------------------------------
+    //-----------------------------------------------------------------
+    // トークンの発行APIの呼び出し
+    public void issueLoginToken(Acanthus acanthus, EditText emailForm, EditText passwordForm) {
+        Retrofit retrofit = new Retrofit.Builder()
+                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/acanthus/")
+                .addConverterFactory(JacksonConverterFactory.create())
+                .build();
+        final AccountsRest accountsRest = retrofit.create(AccountsRest.class);
+
+        String emailAddress = emailForm.getText().toString();
+        String password = passwordForm.getText().toString();
+
+        // ログイン
+        Call<AccountTokenJson> call = accountsRest.issueLoginToken(emailAddress, password);
+        call.enqueue(new Callback<AccountTokenJson>() {
+            @Override
+            public void onResponse(Call<AccountTokenJson> call, Response<AccountTokenJson> response) {
+                if (response.isSuccessful())
+                    setVariableFromResponse(acanthus, response.body().getToken());
+            }
+
+            @Override
+            public void onFailure(Call<AccountTokenJson> call, Throwable t) {
+            }
+        });
+    }
+
+    //-----------------------------------------------------------------
+    //-----------------------------------------------------------------
+    // ログイン成功時に値の変更を行う
+    private void setVariableFromResponse(Acanthus acanthus, String token) {
+        acanthus.setToken(token);
+        acanthusMutableLiveData.setValue(acanthus);
+    }
+    //-----------------------------------------------------------------
+
+}
diff --git a/app/src/main/res/layout/activity_login_screen.xml b/app/src/main/res/layout/activity_login_screen.xml
index 19edf2b..d7d7375 100644
--- a/app/src/main/res/layout/activity_login_screen.xml
+++ b/app/src/main/res/layout/activity_login_screen.xml
@@ -22,6 +22,7 @@
         android:layout_height="wrap_content"
         android:layout_marginStart="240dp"
         android:layout_marginTop="400dp"
+        android:onClick="onClickLogin"
         android:text="ログイン"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
@@ -72,6 +73,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginStart="60dp"
+        android:onClick="onClickSignUp"
         android:text="新規登録する"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toStartOf="parent"