Index: branches/version-2_5-dev/data/Smarty/templates/admin/basis/index.tpl
===================================================================
--- branches/version-2_5-dev/data/Smarty/templates/admin/basis/index.tpl	(revision 20684)
+++ branches/version-2_5-dev/data/Smarty/templates/admin/basis/index.tpl	(revision 20685)
@@ -27,5 +27,5 @@
 <script type="text/javascript">//<![CDATA[
 var map;
-
+var marker;
 
 $(function() {
@@ -87,6 +87,14 @@
             map.panTo(latlng);
         }
-        var marker = new google.maps.Marker({map: map, position: latlng});
-        marker.setDraggable(true);
+
+        if (!marker)
+        {
+            marker = new google.maps.Marker({map: map, position: latlng});
+            marker.setDraggable(true);
+        }
+        else
+        {
+            marker.setPosition(latlng);
+        }
 
         // TODO Maker のダブルクリックにも対応したい