diff --git a/app/src/main/java/com/example/citrusclient/views/SignUpActivity.java b/app/src/main/java/com/example/citrusclient/views/SignUpActivity.java
index 9ec5406..e092f40 100644
--- a/app/src/main/java/com/example/citrusclient/views/SignUpActivity.java
+++ b/app/src/main/java/com/example/citrusclient/views/SignUpActivity.java
@@ -1,19 +1,35 @@
 package com.example.citrusclient.views;
 
+import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.EditText;
+import android.widget.TextView;
 
 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 retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+import retrofit2.Retrofit;
+import retrofit2.converter.jackson.JacksonConverterFactory;
 
+import com.example.citrusclient.Citrus;
 import com.example.citrusclient.R;
+import com.example.citrusclient.rest.AccountsRest;
+
+import org.w3c.dom.Text;
 
 public class SignUpActivity extends AppCompatActivity {
 
+    private Retrofit retrofit;
+    private AccountsRest accountsRest;
+    private Citrus citrus;
+
+    //画面起動時
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -28,6 +44,26 @@
 
         });
 
+        //citrusと連携
+        citrus = (Citrus) this.getApplication();
+
+        //端末に情報が登録されているとき
+        if ((citrus.getToken() != null)&&(citrus.getAccountId() != null)){
+            System.out.println("アカウント登録済み");
+            //MainActivityに遷移
+            Intent  intent = new Intent(SignUpActivity.this,MainActivity.class);
+            startActivity(intent);
+        }
+
+        //通信の初期化
+        this.retrofit = new Retrofit.Builder()
+                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/citrus/")
+                .addConverterFactory(JacksonConverterFactory.create())
+                .build();
+        this.accountsRest = retrofit.create(AccountsRest.class);
+
+
+
         findViewById(R.id.button_signup).setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
@@ -37,11 +73,49 @@
                 EditText editpw = (EditText) findViewById(R.id.put_pw);
                 String pw = editpw.getText().toString().trim();
 
-                if(!id.isEmpty() && !pw.isEmpty() && !id.trim().isEmpty() && !pw.trim().isEmpty() ){
-                    //通信
+                //入力欄が空欄の時
+                if(id.isEmpty() && pw.isEmpty() && id.trim().isEmpty() && pw.trim().isEmpty()){
+                    System.out.println("不適切入力");
+                    ((TextView)findViewById(R.id.textView_respons)).setText("適切に入力してください");
+
+                }else if(!id.isEmpty() && !pw.isEmpty() && !id.trim().isEmpty() && !pw.trim().isEmpty() ){
+                    //入力欄が全て適切に入力された場合の処理
+                    Call<String> call = accountsRest.signup(id,pw);
+                    call.enqueue(new Callback<String>() {
+                        @Override
+                        public void onResponse(Call<String> call, Response<String> response) {
+                            if (response.isSuccessful()){
+                                System.out.println("通信成功");
+                                //端末にtoken.id登録
+                                String token = response.body();
+                                citrus.setToken(token);
+                                citrus.setAccountId(id);
+
+                                //画面遷移
+                                Intent  intent = new Intent(SignUpActivity.this,MainActivity.class);
+                                startActivity(intent);
+
+                            }else{
+                                //通信可能（ただしエラーが発生した場合）
+                                //404がPW入力されてないときだけど、前で定義しているからいらないよね..?
+                                System.out.println("通信可能");
+                                if(response.code()==409){
+                                    ((TextView)findViewById(R.id.textView_respons)).setText(("入力したアカウントIDは既に使用されています"));
+                                }
+                            }
+                        }
+                        //通信失敗
+                        @Override
+                        public void onFailure(Call<String> call, Throwable t) {
+                            System.out.println("通信失敗");
+                            System.out.println(t);
+                        }
+                    });
                 }
             }
         });
+
+
     }
 
 }
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