diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/utils/ServiceUtil.kt b/app/src/main/kotlin/jackall/overlaymulticounter/utils/ServiceUtil.kt
new file mode 100644
index 0000000..5a81385
--- /dev/null
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/utils/ServiceUtil.kt
@@ -0,0 +1,22 @@
+package jackall.overlaymulticounter.utils
+
+import android.app.ActivityManager
+import android.content.Context
+import jackall.overlaymulticounter.service.MainService
+
+/**
+ * Created by matsumoto_k on 2017/11/10.
+ */
+class ServiceUtil {
+    companion object {
+        fun isMainServiceRunning(context: Context): Boolean {
+            val manager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
+            for (serviceInfo in manager.getRunningServices(Integer.MAX_VALUE)) {
+                if (MainService::class.java.getName() == serviceInfo.service.className) {
+                    return true
+                }
+            }
+            return false
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt b/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
index 9d51995..655f275 100644
--- a/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
@@ -23,6 +23,7 @@
 import jackall.overlaymulticounter.db.CounterRealmHelper
 import jackall.overlaymulticounter.service.MainService
 import jackall.overlaymulticounter.utils.RuntimePermissionUtil
+import jackall.overlaymulticounter.utils.ServiceUtil
 import jackall.overlaymulticounter.vo.Counter
 import java.util.*
 
@@ -56,8 +57,13 @@
     fun onClickStartService(view: View) {
         // TODO: RuntimePermissionの処理
         if (RuntimePermissionUtil.checkOverlayPermission(view.context)) {
-            val intent = Intent(view.context, MainService::class.java)
-            view.context.startService(intent)
+            if (ServiceUtil.isMainServiceRunning(view.context)) {
+                val intent = Intent(view.context, MainService::class.java)
+                view.context.stopService(intent)
+            } else {
+                val intent = Intent(view.context, MainService::class.java)
+                view.context.startService(intent)
+            }
         } else {
             AlertDialog.Builder(view.context)
                     .setMessage("常駐機能を使用するには権限の許可が必要です。")