Please take Hakone tozan bus(bound for Tougendai : 桃源台)and get off the bus at Kami-tonosawa :上塔ノ沢. It takes 3min and costs 170yen. After that, get back the main street for 1min. You will find Ichinoyu Honkan on your left.
< From Tokyo >
By Tomei high way Atsugi IC, in way of Odawara Atsugi way, it takes about 4 km from Hakoneguchi IC.
< From Nagoya >
By Tomei high way Gotemba IC, in way of Otome Touge, it takes about 1 hour as far as Hakone Tonosawa.