diff --git a/koukyo.js b/koukyo.js
new file mode 100644
index 0000000..1d81eea
--- /dev/null
+++ b/koukyo.js
@@ -0,0 +1,7 @@
+/* domon.js - 北緯38.891度, 東経139.824度, ズームレベル16 で地図表示 */
+
+var mymap = L.map("mymap").setView([38.891, 139.824], 16);
+L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
+ attribution:
+   '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
+}).addTo(mymap);