var mymap = L.map("mymap").setView([38.8877,139.8363], 15);
L.tileLayer('//cyberjapandata.gsi.go.jp/xyz/std/{z}/{x}/{y}.png', {
 attribution:
   '<a href="http://maps.gsi.go.jp/development/ichiran.html">国土地理院</a>'
}).addTo(mymap);