diff --git a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
new file mode 100644
index 0000000..2fed0e0
--- /dev/null
+++ b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
@@ -0,0 +1,46 @@
+package com.example.cosmosclient.views;
+
+import android.content.Intent;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+
+import com.example.cosmosclient.R;
+
+public class SigninActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_signin);
+
+        //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);
+
+        //Sign inボタンの処理
+        SigninButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(getApplication(), GroupList.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){
+                Intent intent = new Intent(getApplication(), SignupActivity.class);
+                startActivity(intent);
+                finish();
+            }
+        });
+    }
+}