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)
+    }
 }
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index f7d53cf..0aeccc4 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -14,14 +14,25 @@
         android:layout_height="match_parent"
         android:background="#96ffffff"
         android:focusable="true"
-        android:focusableInTouchMode="true"
-        android:paddingTop="8dp">
+        android:focusableInTouchMode="true">
+
+        <FrameLayout
+            android:id="@+id/main_banner_frame"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
 
         <LinearLayout
             android:id="@+id/main_button_layout"
             android:layout_width="match_parent"
             android:layout_height="32dp"
-            android:orientation="horizontal">
+            android:layout_marginTop="8dp"
+            android:orientation="horizontal"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/main_banner_frame">
 
             <ImageButton
                 android:layout_width="0dp"