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Onsen

Yumoto's gentle alkaline spring fills all three baths — New Moon, Half Moon, and Full Moon. Same source, three different atmospheres.

New moon, half moon, full moon —
three baths, one spring.

Tsukinoya's spring is a simple alkaline water from Yumoto — clear, soft, and gentle on the skin. Three baths named for the moon's phases await.

SHINGETSU-NO-YU

Indoor bath, finest after midnight

Stone-tiled indoor bath. Most beautiful after midnight, when moonlight slants through the window.

HANGETSU-NO-YU

Private family bath

Reservable family bath for couples and families. No extra charge — book at check-in.

MANGETSU-NO-YU

Moon-viewing outdoor bath

Tsukinoya's centrepiece. An outdoor bath open to the sky — moon-gazing while soaking, a pleasure unique to this inn.

SPRING TYPESimple alkaline spring, clear
EFFECTSFatigue recovery / Neuralgia / Skin care
SOURCEYumoto Onsen
DAY USE¥1,000 / adult (reserve in advance)

Three moon baths
for evening and night.

SHINGETSU

Hours

Evening: 15:00–23:00
Morning: 6:00–9:00

HANGETSU

Reservation

45-min slot at check-in. No extra charge.

MANGETSU

Moon-gazing feature

Open-sky outdoor bath. Clear evenings offer genuine moon-gazing. Open until 22:00.

DAY USE

By reservation

¥1,000 per adult. May be unavailable at busy times.

Yumoto's spring
fills the moon inn.

Hakone-Yumoto is the oldest and most storied of Hakone's seventeen spring areas.
Tsukinoya draws from that same source and sends it to all three baths.

A simple alkaline spring with a high pH — the kind that coats the skin gently. Guests often comment on the softness they feel after bathing.

All three baths share the same source. The indoor New Moon bath, the private Half Moon bath, the outdoor Full Moon bath — same water, three entirely different feelings depending on the setting.

Yumoto's spring flows abundantly and hot. At Tsukinoya, we cool it to a comfortable temperature while keeping it as fresh as possible.

Frequently asked questions.

Can I use the baths for the day?

Yes, with prior reservation. ¥1,000 per adult, typically 11:00–15:00.

Are guests with tattoos accepted?

Tattooed guests cannot use the public bath but may use the private Half Moon family bath. Please notify us in advance.

Is the water natural flow?

We use Yumoto's onsen source, with minimal added water for temperature control.

How many times can I use the family bath?

Overnight guests are allocated one 45-min session. Additional slots may be available — please ask.

Reserve a stay or day-use bath

Book stays via form. Day-use by phone reservation.