Kagoshima · Sakurajima
Sakurajima Magma Onsen (Rainbow Sakurajima)
桜島マグマ温泉（国民宿舎レインボー桜島）
A day bath inside a public inn 15 minutes by ferry from Kagoshima port and 8 minutes' walk from Sakurajima port. Water rises at 51°C from a magma layer 1,000 m below, clouded rust-brown with iron, and flows freely through a bath hall looking across Kinkō Bay to the city. ¥460, 11:00–21:00 — a bargain after touring the volcano or the lava seaside trail. The free 100-metre Lava Nagisa Park footbath is within walking distance. Operations may be affected by volcanic alert levels.
- Price (adult)
- ¥460
- Hours
- 11:00–21:00
- Closed
- Open daily
- Access
- 15 min by Sakurajima Ferry from Kagoshima port, then 8 min on foot; or Sakurajima Island View bus to Rainbow Sakurajima
- Water type
- Iron spring
- Tattoos
- Ask ahead
- Phone
- 099-293-2323
- Official site
- rainbow-sakurajima.com/spa ↗
- Open in Google Maps
- Google Maps ↗
Essentials
Stay in this onsen town
Compare and book stays in Sakurajima. Day bathing itself needs no booking.
Opens partner booking site (affiliate)
Why go
- Rust-brown water heated by an active volcano
- Views over Kinkō Bay to the city
- ¥460, 8 min walk from Sakurajima port
Before you go
- No official tattoo policy is published — ask at reception.
- Ryokan day-use hours are limited and may be suspended in peak season — phone the same morning.
- Payment is usually by ticket machine in cash — bring coins.
- Last entry is 30–60 minutes before closing.
Features
Mood & scenery
Rules & private
Price
Amenities
✔ Verified operating: 2026-09 公式サイト 2025-10（大人460円・11:00–21:00 受付20:00・無休・タオル販売）
Prices and hours change. Check official sources before visiting.
More in this area
Sunamushi Kaikan Saraku
The municipal facility for Ibusuki's famous natural sand bath. Change into a rental yukata, walk down to the beach, and staff bury you in hot sand for about ten minutes; afterwards rinse off in the indoor onsen. At high tide the sand baths move under a roof. ¥1,500 includes the yukata; bring or buy a towel. 20 minutes on foot or 5 by bus from Ibusuki Station.
Kirishima Hotel Iōdani Garden Bath
A vast garden bath hall fed by 14 sources at 1,400 litres a minute, with four water types — sulfur, alum, saline and iron — in one place. The central pool is mixed-gender (women-only hours; bathing garments allowed).
Nigatsuden Onsen Tonosama-yu
A public bath from the early Shōwa era beside the ruins of the Shimazu lords' private bathhouse. The Shimazu crest decorates the tub; the salty water runs hot and free-flowing. Free drinking spring too — a local follow-up to the sand bath.