A fully private relaxation floor combining high-concentration oxygen and sauna, open 24 hours. The details below were checked against the official website (checked: 2026-10-06).
- ✅ Couples / mixed-gender: OK official source
Prices
| Plan or room | Guests | Time | Price |
|---|---|---|---|
| Private sauna | up to 3 | 90 min | from ¥6,000 |
| Private sauna | up to 3 | 120 min | from ¥8,000 |
| Private sauna | up to 3 | Night 5 hours | from ¥12,000 |
All prices are starting prices and rise by time slot and plan. This is part of a relaxation floor, not a dedicated sauna venue. Massage-chair seats and private shower rooms (no sauna) on the same floor cost less. Couples can use it.
Details
| Area | Tokyo, Japan |
|---|---|
| Access | 1 min walk from JR Shimbashi Station |
| Hours | 24 hours |
| Phone | 03-3528-8589 |
| Official site | grandhammer.jp/floor-guide/2083 (Japanese) |
| Map | Search on Google Maps |
Prices are in Japanese yen. Prices, discounts and hours change, so confirm on the official site before you book. Many venues charge by the number of guests: check whether a price is per room or per person. This page in Japanese: O2プラージュ（Grand Hammer）. See all private saunas in Japan.