diff --git a/app/src/main/java/com/example/citrusclient/views/MainActivity.java b/app/src/main/java/com/example/citrusclient/views/MainActivity.java
index 81d39a6..2401d75 100644
--- a/app/src/main/java/com/example/citrusclient/views/MainActivity.java
+++ b/app/src/main/java/com/example/citrusclient/views/MainActivity.java
@@ -1,14 +1,19 @@
 package com.example.citrusclient.views;
 
 import android.os.Bundle;
+import android.view.MenuItem;
 
 import androidx.activity.EdgeToEdge;
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
+import androidx.fragment.app.Fragment;
 
 import com.example.citrusclient.R;
+import com.google.android.material.bottomnavigation.BottomNavigationView;
+import com.google.android.material.navigation.NavigationBarView;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -27,5 +32,36 @@
                 .replace(R.id.fragment_container, new MyBookshelfFragment())
                 .commit();
 
+        setNavViewEvent();
+
+    }
+
+    private void showFragment(Fragment fragment){
+        getSupportFragmentManager().beginTransaction()
+                .replace(R.id.fragment_container, fragment)
+                .addToBackStack(null)
+                .commit();
+    }
+
+    private void setNavViewEvent(){
+        BottomNavigationView navView = findViewById(R.id.bottomNavigationView);
+        navView.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
+            @Override
+            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
+                int itemId = menuItem.getItemId();
+                if(itemId == R.id.book){// 本棚
+                    showFragment(new MyBookshelfFragment());
+                } else if(itemId == R.id.search){//検索
+
+                } else if(itemId == R.id.home){//ホーム
+
+                }else if(itemId == R.id.calendar){ //カレンダー
+
+                }else if(itemId == R.id.face){//マイページ
+
+                }
+                return true;
+            }
+        });
     }
 }
\ No newline at end of file