diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 2eed1cc..0971d0c 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -10,13 +10,15 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".MainActivity">
+        <activity android:name=".activity.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <service android:name=".service.MainService" />
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/Const.kt b/app/src/main/kotlin/jackall/overlaymulticounter/Const.kt
new file mode 100644
index 0000000..2ea1ae2
--- /dev/null
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/Const.kt
@@ -0,0 +1,11 @@
+package jackall.overlaymulticounter
+
+/**
+ * Created by matsumoto_k on 2017/11/08.
+ */
+class Const {
+    companion object {
+        const val serviceChannelId = "mainService"
+        const val serviceNotificationId = 1
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/MainActivity.kt b/app/src/main/kotlin/jackall/overlaymulticounter/MainActivity.kt
deleted file mode 100644
index f5e6374..0000000
--- a/app/src/main/kotlin/jackall/overlaymulticounter/MainActivity.kt
+++ /dev/null
@@ -1,12 +0,0 @@
-package jackall.overlaymulticounter
-
-import android.support.v7.app.AppCompatActivity
-import android.os.Bundle
-
-class MainActivity : AppCompatActivity() {
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
-    }
-}
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt b/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
new file mode 100644
index 0000000..f8f1e76
--- /dev/null
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
@@ -0,0 +1,13 @@
+package jackall.overlaymulticounter.activity
+
+import android.os.Bundle
+import android.support.v7.app.AppCompatActivity
+import jackall.overlaymulticounter.R
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+    }
+}
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/service/MainService.kt b/app/src/main/kotlin/jackall/overlaymulticounter/service/MainService.kt
new file mode 100644
index 0000000..666ca47
--- /dev/null
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/service/MainService.kt
@@ -0,0 +1,28 @@
+package jackall.overlaymulticounter.service
+
+import android.app.PendingIntent
+import android.app.Service
+import android.content.Intent
+import android.os.IBinder
+import android.support.v4.app.NotificationCompat
+import jackall.overlaymulticounter.Const
+import jackall.overlaymulticounter.R
+import jackall.overlaymulticounter.activity.MainActivity
+
+/**
+ * Created by matsumoto_k on 2017/11/08.
+ */
+class MainService : Service() {
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        val notificationBuilder = NotificationCompat.Builder(this, Const.serviceChannelId)
+                .setSmallIcon(R.mipmap.ic_launcher) // TODO:白抜きのアイコンをセット
+        notificationBuilder.setContentIntent(PendingIntent.getActivity(this, 0, Intent(this, MainActivity::class.java), PendingIntent.FLAG_UPDATE_CURRENT))
+        startForeground(Const.serviceNotificationId, notificationBuilder.build())
+        return START_STICKY
+    }
+
+    override fun onBind(intent: Intent?): IBinder? {
+        return null
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 813d007..a0d88c9 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="jackall.overlaymulticounter.MainActivity">
+    tools:context="jackall.overlaymulticounter.activity.MainActivity">
 
     <TextView
         android:layout_width="wrap_content"