diff --git a/src/main/java/com/mapconductor/mappls/MapplsViewController.kt b/src/main/java/com/mapconductor/mappls/MapplsViewController.kt
index c7791b2..d679641 100644
--- a/src/main/java/com/mapconductor/mappls/MapplsViewController.kt
+++ b/src/main/java/com/mapconductor/mappls/MapplsViewController.kt
@@ -128,6 +128,8 @@ class MapplsViewController(
         groundImageController.clear()
         circleController.clear()
         rasterLayerController.clear()
+        // 拡張モジュール（クラスタリングなど）が登録した Strategy のマーカーも消す。
+        clearStrategyMarkerControllers()
     }
 
     override fun moveCamera(position: MapCameraPosition) = handleMoveCamera(position)