A municipal hot spring facility that stands at the innermost of Nakagawa Onsen, one of Takeda Shingen's hidden hot water. The name of the hall is after the beech tree, a symbolic presence of Nishitanzawa. It is located at the bottom of a valley along a mountain stream, at the innermost part of the inn, and the approach is narrow in topography, so careful driving is required in the case of cars. The single-sex baths are tiled large baths, and rock-built open-air baths. The large bathhouse is a bright bathroom with plenty of lighting. There is no dining room, but food and drink are allowed in the great hall on the second floor.

A parking area located just past the prefectural border between Shizuoka and Kanagawa prefectures on the Tomei Expressway and Uphill Line. There is a drinking fountain, a dog park with a trash can set up, and you can play with your pet dog in a spacious dog park, with a view of Mount Fuji. The shopping corner also sells goods for pet dogs. The number of seats in the 24-hour food court is one of the largest among Tomei Expressway's PAs. "Ginger-grilled set meal" is very popular. In addition to the facilities of a coin shower and a coin-operated laundry (9 to 23 o'clock), there is also a "Platto Park" which can be used 24 hours a day.

Parking area located in the prefectures of Shizuoka and Kanagawa prefectures. The Tomei Expressway on the section where the PA is located is divided into a right route and a left route, and the PA can only be used from the left route. Perhaps because it is close to the Tanzawa Mountains, the shop has a lineup of outdoor brand "mont-bell". There are plenty of limited products with original designs in collaboration with PA. At the "Yamatoya Shokudo", Ayusawa PA specialty "Yokubari set meal" is popular. If you are hungry, the specialty "Tanzawa Anpan" is also recommended.