diff --git a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
index 4fe2370..5cd0d4e 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
@@ -5,6 +5,7 @@
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
+import android.widget.EditText;
 
 import com.example.cosmosclient.R;
 
@@ -15,17 +16,24 @@
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_signin);
 
-//        Button SigninButton = findViewById(R.id.SigninButton);
-//        SigninButton.setOnClickListener(new View.OnClickListener() {
-//            @Override
-//            public void onClick(View v) {
-//                Intent intent = new Intent(getApplication(), GroupsListActivity.class);
-//                startActivity(intent);
-//                finish();
-//            }
-//        });
+        //各種IDを取得
+        Button SigninButton = findViewById(R.id.SigninButton);
+        Button SignupButton = findViewById(R.id.SignupButton);
+        EditText EmailAddressText = findViewById(R.id.EMailAddressText);
+        EditText PasswordText = findViewById(R.id.PasswordText);
+        Button ForgotPasswordButton = findViewById(R.id.ForgotPasswordButton);
 
-        Button  SignupButton = findViewById(R.id.SignupButton);
+        //Sign inボタンの処理
+        SigninButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(getApplication(), SignupActivity.class);
+                startActivity(intent);
+                finish();
+            }
+        });
+
+        //サインアップ画面への遷移処理
         SignupButton.setOnClickListener(new View.OnClickListener(){
             @Override
             public void onClick(View v){