Aratama no Yu

あらたまの湯あらたまのゆ

Weekly-swapping baths at a round day-onsen near Hamamatsu's forest park

Bathing ComplexTemporarily Closed

Chubu·Shizuoka

053-582-1126 aratamanoyu.jp

Day Use

Yes

MonClosed

Tue09:00–21:00

Wed09:00–21:00

Thu09:00–21:00

Fri09:00–21:00

Sat09:00–21:00

Sun09:00–21:00

Closed for large-scale renovation from April 1, 2026, for about a year, with reopening planned for fiscal 2027. Normally closed on Mondays, but when a national holiday falls on a Monday the bath opens that day and closes the following day instead.

¥730

Adult admission is 730 yen (650 yen with certain partner coupons). Ages 70 and up and elementary school children pay 360 yen (330 yen with partner coupons).

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

TattooYes

Allows entry with visible tattoos

KidsYes

Welcomes children and families

Discounted child/elementary-school admission tickets exist; also has a kids' corner per aggregator listing.

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

ParkingYes

On-site or nearby parking available

浜北温泉浜北2号（台帳番号896-002号）

Hamakita Onsen Well No. 2

曹

Bicarbonate

Color: almost colorless and transparent
Taste: tasteless
Odor: faint hydrogen sulfide; no gas evolution

Sodium Bicarbonate spring

pH 8.7Alkaline

Composition fingerprint1.0 g/kg dissolved · Hypotonic

Na⁺98

HCO₃⁻81

◀ 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

Smooth skindry, rough skin
Recoveryfatigue, stress

A sodium-led bicarbonate spring — the classic juso-sen style. Alkaline (pH 8.7), it gives the slippery, beauty-water feel on the skin and sits squarely in Japan's beauty-water family. At the wellhead the water is almost colorless and transparent, tasteless, with a faint hydrogen sulfide note.

Sampled at wellhead·Analyzed Jan 23, 2017·一般財団法人静岡県生活科学検査センター·Cert no. 第M06048号

Explore the water

Highlights

Foot Bath

Programs

About

Aratama no Yu is a straightforward day-use onsen in the Hamakita area of Hamamatsu, close to the prefectural forest park, housed in a round building that stands out from the usual bathhouse shape. There's one indoor bath, Shinrin no Yu (森林の湯), and one outdoor rock-garden bath, Sekitei no Yu (石庭の湯), and the two swap between the men's and women's sides every week. A sauna (bring your own mat) and a reservable private bath round out the options. The spot sits a bit up in the hills, and visitors describe the outdoor bath as open and airy, especially once the weather turns cool. Afterward, the in-house restaurant, Aratama-tei, serves food, and there's a small shop plus a tatami rest area with a kids' corner.

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Reserve or check availability on a booking site.

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1 year ago· edited

271. Aratama no Yu, Hamamatsu ★ A super sento with onsen water for 730. Opening hours are listed as 09:00 to 21:00 (except Mon). They stamp the Shizuoka 60 Onsen 24/25 rally. Toreco cards are issued for the onsen. According to the website, the men's and women's baths are swapped by week. The bath photos online match the actual place. There is a shop, massage, a restaurant, and a chill-out area. The place is popular, and there were a lot of old men there in the morning. 1. Outdoor area. View of the trees. Overall it was quite comfortable and cozy, even though there were a lot of people in the onsen. 1.1. Large bath, clear water, with a soft-water effect. Temperature 40. 1.2. Small bath at 38. 1.3. Small bath at 40. 1.4. Massage bath 2. Indoor area. The interior makes active use of the look of exposed concrete that feels expensive. It is comfortable to breathe. 2.1. Large bath, clear water, temperature 40. 2.2. Small bath, clear water, temperature 38. 2.3. Sauna. 2.4. Cold bath. The onsen was really great in the morning, it was very worthwhile. 12.11.2024

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Last updated October 13, 2026