diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt b/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
index bee88a1..0848df3 100644
--- a/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
@@ -4,11 +4,15 @@
 import android.databinding.DataBindingUtil
 import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
+import com.google.android.gms.ads.AdSize
+import jackall.overlaymulticounter.Const
 import jackall.overlaymulticounter.R
 import jackall.overlaymulticounter.databinding.ActivityMainBinding
 import jackall.overlaymulticounter.db.CounterRealmHelper
+import jackall.overlaymulticounter.utils.AdUtil
 import jackall.overlaymulticounter.viewmodel.MainViewModel
 import jackall.overlaymulticounter.vo.Counter
+import kotlinx.android.synthetic.main.activity_main.view.*
 
 class MainActivity : AppCompatActivity() {
 
@@ -31,4 +35,9 @@
             )
         }
     }
+
+    override fun onStart() {
+        super.onStart()
+        AdUtil.startBannerAd(this, binding.root.main_banner_frame, AdSize.BANNER, Const.mainBannerUnitId)
+    }
 }