HOTEL THE MITSUI HAKONE: Onsen in Every Room

Explera DMC Japan is taking requests for HOTEL THE MITSUI HAKONE, which opens on 15 December 2026 in Kowakudani, Hakone. All 126 rooms have their own natural hot spring bath and a balcony or terrace. The hotel stands on former Mitsui family villa grounds, and reservations opened on 15 July 2026.

Mitsui Fudosan announced the opening date in July 2026. The hotel is run by Mitsui Fudosan Resort Management and is the sister of HOTEL THE MITSUI KYOTO.

What does HOTEL THE MITSUI HAKONE offer?

Rooms, suites and villas. 126 in total, each with a private onsen bath and its own outdoor space.
A large site. About 135,500 square metres of grounds in Kowakudani.
Dining. Kaiseki, sushi and teppanyaki restaurants.
A spa. A thermal spring spa for treatments.

A woman relaxing during a spa treatment, with candles and towels beside her.

Who do we book into the hotel?

Couples and VIPs. A private onsen in every room suits guests who would rather not use a shared bath, including clients with tattoos.
Small luxury groups. We hold rooms for small groups and private families once dates are fixed.
Early bookings. A new hotel fills its first season fast, so we request rooms as soon as clients choose their dates.
A Tokyo add-on. Hakone is an easy trip from Tokyo by train or car, so the hotel fits at the start or end of a Japan trip.

See our guides to Hakone and Kinosaki, onsen etiquette and onsen and tattoos.

Mist lying between snow-dusted mountain ridges in winter.

Sources: Mitsui Fudosan: HOTEL THE MITSUI HAKONE to open on December 15, 2026 and HOTEL THE MITSUI HAKONE: Official website.

FAQ

When does HOTEL THE MITSUI HAKONE open? On Tuesday 15 December 2026. Reservations opened on 15 July 2026.

Where is HOTEL THE MITSUI HAKONE? In Kowakudani, Hakone, in Kanagawa Prefecture, on land that was once a Mitsui family villa.

Do all rooms have a private onsen? Yes. Each of the 126 rooms has its own natural hot spring bath and a balcony or terrace.

Is HOTEL THE MITSUI HAKONE good for clients with tattoos? A private onsen in the room lets guests with tattoos bathe without using a shared bath. We confirm spa rules for each booking.

Planning a Hakone stay for your clients? Write to b2b@explera.jp, message the trade desk on WhatsApp at +66 93 656 8090, or register on the B2B portal. Proposals within 24 hours. IATA TIDS 96215733, ASTA member 900408341.