HOME / Onsen

Onsen

Three baths, one gentle salt spring. Ohiradai's chloride water warms you slowly and deeply — the perfect end to a day of exploring Hakone.

ONSEN

Ohiradai's gentle salt spring — three ways to soak.

Ohiradai's mildly saline spring warms you from the core — a 'warming bath' famous for its lingering heat. At Masutomi, enjoy it three ways: communal, open-air, or private.

INDOOR PUBLIC BATH

Masu-no-yu

A warm, wood-lined indoor bath. The same spring that has soothed guests here for generations. Separated by gender.

OPEN-AIR BATH

Tomi-no-yu

Small but authentic — an open-air bath surrounded by Ohiradai's mountain air. Gender rotation applies.

PRIVATE FAMILY BATH

Kazoku-no-yu

The whole bath for your family or couple only. Especially popular with families with young children.

SPRING TYPEMild saline (chloride spring), clear

TEMPERATUREApprox. 42°C (heated)

BENEFITSHeat retention, fatigue, neuralgia, cold sensitivity

DAY USEEnquire (subject to availability)

BATH GUIDE

Three ways to experience
Masutomi Ryokan's spring.

PUBLIC

Masu-no-yu guide

Open 6:00–22:00. Gender rotation applies. Take your time in the warm, wood-framed tub.

OPEN-AIR

Tomi-no-yu guide

Open 6:00–21:00. Gender rotation. Small but genuine — the mountain air makes it worth it.

PRIVATE

Kazoku-no-yu guide

15:00–21:00, ¥1,500/hour. Reserve at the front desk. Popular with families with young children.

GUIDE

Tips for enjoying the baths

Mild salt springs are relatively gentle even for longer soaks. Stay hydrated. Pat yourself dry thoroughly after — it helps the warming effect last longer.

SOURCE

The story of Ohiradai's spring

Ohiradai is one of several onsen towns along the Hakone Tozan Railway. Its mildly saline (chloride) spring is prized as a 'warming bath' — the mineral content coats the skin, retaining body heat long after you step out.

The community bath Hime-no-Yu is just 3 minutes' walk — a sign of how richly this land is blessed with hot water. Masutomi Ryokan draws from the same deep source.

FAQ

Frequently asked questions.

What are the bath hours?

Public and open-air baths: 6:00–22:00 (gender rotation). Private 'Kazoku-no-yu': 15:00–21:00, reserve at front desk.

What is the private bath fee?

¥1,500 per hour (tax included). Reserve at the front desk after check-in.

Can children use the hot spring?

Ohiradai's mild salt spring is gentle enough for children. No restrictions on younger guests.

What type of spring water is it?

Mildly saline chloride spring — clear in colour. The gentle salt content retains warmth, valued for fatigue, cold sensitivity, and neuralgia.