Onsen OniOnsen Oni

Search Onsen Oni

Search onsen, areas, prefectures and pages.

Tōnosawa Ichinoyu Honkan

塔ノ沢一の湯 本館とうノさわはじめのゆ ほんかん

Lodging
Hakone OnsenTonosawa Onsen
Kanto·Kanagawa
0460-85-5334ichinoyu.co.jp

Day Use

Yes
13:00–20:00

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Capabilities

Private BathYes

Private bath available for day-use visitors or hotel guests to reserve

Room OnsenYes

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

TattooYes

Allows entry with visible tattoos

DiningYes

Restaurant or dining open to visitors (not just hotel meal plans)

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels available to rent or borrow

Rest AreaYes

Relaxation space for after bathing

ParkingYes

On-site or nearby parking available

塔ノ沢温泉

Tonosawa Onsen

Operated by · 塔ノ沢一の湯 本館

Mixed source

湯
Simple
Color
colorless and transparent
Taste
not recorded
Odor
odorless
Hot source · 48°CStrongly alkaline
Known good for
  • Aches & jointsstiff shoulders
  • Smooth skindry, rough skin
  • Recoveryfatigue, stress

An alkaline simple thermal spring drawing on a blend of the Yumoto No. 37, 50, and 110 wells at Tonosawa in Hakone. At pH 9.1 it is strongly alkaline, giving the slippery, skin-smoothing feel of Japan's beauty-water family. The water is colorless, transparent, and odorless, gentle on the body with little mineral edge.

Analyzed Jul 23, 2014·神奈川県温泉地学研究所·Cert no. 神奈川県温泉登録第1号

Explore the water

Views

River

About

A ryokan that has been open since 1630 and is registered as a tangible cultural property. The 4-storey wooden sukiya-zukuri (数寄屋造り) building sits along Hayakawa gorge. Shared indoor baths rotate between men and women daily; some rooms come with their own open-air or view baths. There is also a kashikiri (貸切) private indoor bath made from Italian marble imported during the Taisho era. Day-use bathing is available.

Loading map…

Reserve or check availability on a booking site.

Rakuten TravelStayJalanStay
SM
Sergey M
2 years ago

187. Tonosawa Ichinoyu Honkan, Hakone Day-use bathing should be 1400 with a towel set + the receipt lets you visit other Ichinoyu locations in Hakone for free that same day (I got into this one for free using the receipt). Day-use hours are 13:00 to 20:00. One indoor bath. Clear water, hot temperature. Comfortable to breathe inside. Window view of the river. Worth visiting if you're doing the Ichinoyu receipt run. Otherwise can be skipped.

1
2
3
4
Onsen Oni

Last updated June 25, 2026