Solaniwa Onsen

空庭温泉 OSAKA BAY TOWERそらにわおんせん OSAKA BAY TOWER

Urban onsen theme park with gardens, saunas, and private baths inside an Osaka skyscraper

Bathing Complex

Kansai·Osaka

06-7670-5126 solaniwa.com

Day Use

Yes

11:00–23:00

¥2,310

Adult 2,310–3,630 yen (by ticket type A–E, varies by date). Night rate (after 17:00) 1,980–2,420 yen. Children (age 4–elementary) 1,320 yen flat; age 70+ 1,800 yen. Bathing tax (150 yen) extra. Towels and yukata included.

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Sauna room of any kind

Cold BathYes

Cold water plunge bath, typically used after sauna

Bathing Arrangements

Private BathYes

A private bath you can reserve for yourself or your group

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

TattooWith Conditions

Allows entry with visible tattoos

Tattoo cover stickers available for purchase on-site. All tattoos must remain fully covered throughout visit. Private baths (kashikiri) also available as an alternative.

KidsYes

Welcomes children and families

Children aged 4 to elementary school: flat 1,320 yen. Under 4 years: free. Groups of under-16s only permitted until 19:00; under-18s only until 22:00.

DiningYes

A restaurant or dining room open to visitors, not only meals for overnight guests

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels to rent or borrow at the desk

Rest AreaYes

Relaxation space for after bathing

大阪ベイタワー温泉

Osaka Bay Tower Onsen

湯

Simple

Sodium Bicarbonate spring

Hot source · 45°CHigh silica

Composition fingerprint0.4 g/kg dissolved · Hypotonic

Na⁺96

HCO₃⁻88

◀ CationsAnions ▶

Sodium Na⁺: salt's cation — pairs with chloride to make the water salty.
Bicarbonate HCO₃⁻: "soda" — softens skin, leaves it smooth.

Known good for

Aches & jointsstiff shoulders
Smooth skindry, rough skin
Recoveryfatigue, stress

The house source, Osaka Bay Tower Onsen, is a gentle simple thermal water classified as hypotonic, weakly alkaline and hot. Mineralization is light at 0.42 g/kg, so it reads soft rather than assertive on the skin, and bicarbonate carries almost 88% of the anion balance, which rounds the touch out further. Metasilicic acid at 70.8 mg/kg puts it in Japan's beauty-water family — enough silica to leave the thin film that makes skin feel noticeably smoother after a soak.

Analyzed Aug 23, 2019·日本水処理工業株式会社

Explore the water

Highlights

Ganbanyoku

Foot Bath

About

Solaniwa Onsen sits inside the Osaka Bay Tower in Bentencho, occupying several floors of the skyscraper. The bath floor has indoor pools and open-air baths, plus ten private open-air baths (kashikiri, 貸切露天風呂) you can book by the 90-minute slot. A separate sauna zone (optional add-on) has five or six rooms with different temperatures and styles. The rooftop Japanese garden has a foot bath where you can sit outside. Beyond the baths there is ganbanyoku (岩盤浴, heated stone beds), a lounge with recliner chairs and a large manga collection, several food areas, fish therapy, and arcade games. Entry includes yukata, bath towel, and full wash amenities.

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Reserve or check availability on a booking site.

JalanDay use

3.0

1 review

Grigorii ...

2 years ago

A super sento that costs from 2460 on weekdays, and a whopping 3780 on holidays. Large grounds — at the entrance you get to choose a yukata (several men's and women's options), and you walk around the entire facility in a yukata. The onsen zone isn't huge, but the water is supposedly 100% natural and undiluted. On the premises there's an arcade, a shooting gallery, and restaurants. Overall, feels like being in an anime at some kind of festival. (There's also kashikiri — officially only available to families, but as the staff said, nobody actually checks.)

Sergey M

2 years ago· edited

31. Solaniwa Onsen, Osaka ★ A super sento with hot spring water. There is massage, a food area, an arcade area, a rooftop garden, and places to relax. By the bridge, they were putting on some kind of mini show with a guy for everyone. There also seemed to be a cave sauna. The ticket costs just under ¥3,000. They give you a small towel, a large towel, a bag, and a yukata. About the baths: 1. The indoor bath area includes: - a small cold bath; - a silk bath, the water was white with white spots, the temperature display said 40; - a small rectangular bath with round pieces of wood floating in it; - a large rectangular bath with a view through a fence and glass toward the garden, the temperature display said 40 degrees. 2. The outdoor bath area includes: - a bath with carbonated water, the temperature display said 37; - a bath with rocks with a temperature of 40; - another bath with rocks with a temperature of 42, marked as 100% natural hot spring. Except for the silk bath, the water was a clear greenish color, and I did not really remember the smell. There were a lot of people on January 1, but the facilities handled it fine. The massage after the bath was excellent. It was good, and the crowd was not a hassle. 01.01.2024