diff --git a/AirBomber/AirBomber/FormAirBomberConfig.cs b/AirBomber/AirBomber/FormAirBomberConfig.cs
index 754d5b8..51e0803 100644
--- a/AirBomber/AirBomber/FormAirBomberConfig.cs
+++ b/AirBomber/AirBomber/FormAirBomberConfig.cs
@@ -14,7 +14,7 @@ namespace AirBomber
     {
         DrawningBomber _airBomber = null;
 
-        private event AirBomberDelegate EventAddAirBomber;
+        private Action<DrawningBomber> EventAddAirBomber;
         public FormAirBomberConfig()
         {
             InitializeComponent();
@@ -39,11 +39,11 @@ namespace AirBomber
             pictureBoxObject.Image = bmp;
         }
 
-        public void AddEvent(AirBomberDelegate ev)
+        public void AddEvent(Action<DrawningBomber> ev)
         {
             if (EventAddAirBomber == null)
             {
-                EventAddAirBomber = new AirBomberDelegate(ev);
+                EventAddAirBomber = ev;
             }
             else
             {