diff --git a/app/src/main/java/com/example/nemophila/LoginActivity.java b/app/src/main/java/com/example/nemophila/LoginActivity.java
index e08d474..25dba64 100644
--- a/app/src/main/java/com/example/nemophila/LoginActivity.java
+++ b/app/src/main/java/com/example/nemophila/LoginActivity.java
@@ -1,14 +1,29 @@
 package com.example.nemophila;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.constraintlayout.widget.ConstraintSet;
 
 import android.os.Bundle;
 
+import com.example.nemophila.resources.AccountsRest;
+
+import retrofit2.Retrofit;
+import retrofit2.converter.jackson.JacksonConverterFactory;
+
 public class LoginActivity extends AppCompatActivity {
 
+    private Retrofit retrofit;
+    private AccountsRest AccountsRest;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_login);
+        //通信の初期化
+        this.retrofit = new Retrofit.Builder()
+                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/nemophila/")
+                .addConverterFactory(JacksonConverterFactory.create())
+                .build();
+        this.AccountsRest = retrofit.create(AccountsRest.class);
     }
 }
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