diff --git a/app/src/main/java/com/example/tampopo_client/views/LoginActivity.java b/app/src/main/java/com/example/tampopo_client/views/LoginActivity.java
index d34fc94..30d7393 100644
--- a/app/src/main/java/com/example/tampopo_client/views/LoginActivity.java
+++ b/app/src/main/java/com/example/tampopo_client/views/LoginActivity.java
@@ -8,12 +8,15 @@
 import android.view.View.OnClickListener;
 
 import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Toast;
 import androidx.activity.EdgeToEdge;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
 import androidx.lifecycle.ViewModelProvider;
+import com.example.tampopo_client.viewmodels.UserViewModel;
 import com.example.tampopo_client.views.MainActivity;
 import com.example.tampopo_client.R;
 
@@ -32,10 +35,28 @@
     });
     userViewModel = new ViewModelProvider(this).get(UserViewModel.class);
 
+    userViewModel.getToken().observe(this, token -> {
+      if (token != null) {
+        // → ログイン成功。次の画面へ遷移
+        Intent i = new Intent(this, MainActivity.class);
+        i.putExtra("TOKEN", token);
+        startActivity(i);
+        finish();   // 戻ってこないなら
+      }
+    });
+    userViewModel.getError().observe(this,
+        msg -> { if (msg != null) Toast.makeText(this, msg, Toast.LENGTH_SHORT).show(); });
+
     Button button_login = (Button) findViewById(R.id.loginbutton);
     button_login.setOnClickListener(new OnClickListener(){
 
       public void onClick(View v){
+        EditText useridInput = (EditText)findViewById(R.id.userIDText);
+        String userid = useridInput.getText().toString();
+        EditText passwordInput = (EditText)findViewById(R.id.PasswordText);
+        String password = passwordInput.getText().toString();
+        userViewModel.login(userid, password);
+
         Intent intent = new Intent(LoginActivity.this, MainActivity.class);
         startActivity(intent);