diff --git a/app/src/main/java/com/example/tampopo_client/views/FriendActivity.java b/app/src/main/java/com/example/tampopo_client/views/FriendActivity.java
index 362994f..f556cc1 100644
--- a/app/src/main/java/com/example/tampopo_client/views/FriendActivity.java
+++ b/app/src/main/java/com/example/tampopo_client/views/FriendActivity.java
@@ -1,4 +1,5 @@
 package com.example.tampopo_client.views;
+
 import android.app.Dialog;
 import android.content.Context;
 import android.content.Intent;
@@ -14,18 +15,25 @@
 import androidx.viewpager2.widget.ViewPager2;
 
 import com.example.tampopo_client.R;
+import com.example.tampopo_client.Tampopo;
 import com.example.tampopo_client.views.MyFragmentAdapter;
 import com.google.android.material.tabs.TabLayout;
 import com.google.android.material.tabs.TabLayoutMediator;
+import androidx.lifecycle.ViewModelProvider;
+import com.example.tampopo_client.viewmodels.FriendSentRequestViewModel;
 
 public class FriendActivity extends AppCompatActivity {
 
     private ViewPager2 viewPager;
     private TabLayout tabLayout;
     private MyFragmentAdapter adapter;
+    // フィールド追加
+    private FriendSentRequestViewModel friendSentRequestViewModel;
+    Tampopo tampopo;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
+        tampopo = (Tampopo)getApplication();
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_friend);
 
@@ -53,6 +61,9 @@
         });
         ImageButton openDialogButton = findViewById(R.id.buttonAdd);
         openDialogButton.setOnClickListener(v -> showAddFriendDialog(this));
+        // onCreate内にViewModelの初期化を追加
+        friendSentRequestViewModel = new ViewModelProvider(this).get(FriendSentRequestViewModel.class);
+
 
     }
     public void showAddFriendDialog(Context context) {
@@ -67,9 +78,22 @@
         buttonClose.setOnClickListener(v -> dialog.dismiss());
 
         buttonSearch.setOnClickListener(v -> {
-            String id = editFriendId.getText().toString();
-            // TODO: IDを使って検索処理を行う
-            Toast.makeText(context, "検索: " + id, Toast.LENGTH_SHORT).show();
+            String receiverId = editFriendId.getText().toString().trim();
+            if (receiverId.isEmpty()) {
+                Toast.makeText(context, "IDを入力してください", Toast.LENGTH_SHORT).show();
+                return;
+            }
+
+            String senderId = tampopo.getUserId(); // TODO: 実際のIDに置き換え
+            String token = tampopo.getToken(); // TODO: 実際の認証トークンに置き換え
+
+            friendSentRequestViewModel.sendFriendRequest(senderId, receiverId, token);
+
+            // 成功/失敗メッセージをViewModelから受け取る
+            friendSentRequestViewModel.getOperationResult().observe(this, result -> {
+                Toast.makeText(context, result, Toast.LENGTH_SHORT).show();
+                dialog.dismiss();  // 送信後にダイアログを閉じる
+            });
         });
 
         dialog.show();