Iwaki Yumoto guide ｜ Whole house ｜ Rooms & dorms ｜ Hanare ｜ Refugio del Café ｜ Kitchen ｜ Private sauna ｜日本語

Private sauna in Iwaki Yumoto, steps from Hace

A private Finnish-style sauna, just for your group. 90 minutes, up to 4 people, ¥4,800.

Prices as of November 2026, tax included.

Booking is by LINE only, and the booking menu is in Japanese. That is the one hard part of this sauna, so this page walks you through it step by step.

What it is

“private sauna Sahakomae” (さはこ前) is a small, fully private sauna in Iwaki Yumoto Onsen, a hot-spring town in Fukushima Prefecture. For each 90-minute slot, the whole place belongs to one group. No other guests, no one rushing you.

Sauna room: Finnish style, about 90°C, with a HARVIA stove. Throw water on the stones yourself (self-löyly) to set the steam the way you like it. The benches are tiered, so you can choose how hot a seat to take.
Cold plunge: about 15-17°C, kept cold by a chiller. There is an ice machine and a freezer for ice. The plunge is sized for one person at a time. Showers are right next to it.
Rest area: reclining chairs indoors, a water server, tea bags, a refrigerator, and a Bluetooth speaker if you want your own music.
Capacity: up to 4 people. Two is the most common.

An honest note: there is no outdoor cooling area. You rest indoors on the reclining chairs. If open-air cooling is the best part of sauna for you, this is not that kind of place.

Price and time

	Time	Price (tax included)
One slot	90 minutes	¥4,800 (up to 4 people)
Two slots in a row	210 minutes	¥9,600 (up to 4 people)

Start times: 12:00, 14:00, 16:00, 18:00 or 20:00. Hours are 12:00-22:00, closed irregularly. For two slots in a row, the start must be 18:00 or earlier. Prices are as of November 2026.

How to book (by LINE)

There is no English booking screen and no booking by phone. Follow these steps.

Add the sauna on LINE. Use the button on this page, or search for “private sauna さはこ前”. You need the LINE app. (LINE is a free messaging app.)
Open the booking menu in the LINE chat and choose a date and a start time. The menu is in Japanese. Open it in your phone’s translation tool if you need to. Start times are 12:00, 14:00, 16:00, 18:00 and 20:00.
For 210 minutes, book two slots that follow each other (for example 14:00 and 16:00), one after the other. The last start for this is 18:00.
Mind the deadline. You can book up to 22:00 the day before, and up to 30 days ahead.
Pay by credit card. The card is charged automatically at 22:00 the day before your slot.
On the day, LINE sends you instructions for getting in. Just come to the sauna and bring a swimsuit.

If something goes wrong, email sauna@hace.jp or send a direct message on Instagram (@private_sauna_sahakomae). Messages on LINE are one-way announcements, so replies come by email or Instagram. We do not take phone calls.

[Japanese words you may see]

Words you may see, for example: 予約 (yoyaku, booking) / 友だち追加 (tomodachi tsuika, add friend). Other screen wording is not listed here; use your translation tool.

Location

Address: Corpo Sahakonoyu 201, 183-4 Sankan, Joban-Yumotomachi, Iwaki, Fukushima (福島県いわき市常磐湯本町三函183-4 コーポさはこのゆ201)
About 10 minutes on foot from JR Yumoto Station, or about 3 minutes from the Onsen Jinja bus stop.
30 seconds on foot from Guesthouse Hace, our main house.
It is right by the public bath Sahakonoyu (さはこの湯).
Parking: 1 space, free, on the temple side.

What to bring and what is here

Bring a swimsuit. Swimsuit rental is not available. Swimsuits are worn at all times, and men and women can use the sauna together.
Provided: towels, shampoo, conditioner, body soap, a hair dryer, a changing room.
Tea bags, a water server and a refrigerator are in the rest area.
The Bluetooth speaker goes on the lowest floor level in the sauna room. Please take it out of the room after use.

Cancelling

After a booking is confirmed, cancelling costs a ¥300 fee. Refunds after booking are generally not given.

Good to know before you book

Booking is by LINE only. There is no English booking screen.
There is no outdoor cooling area.
The cold plunge fits one person at a time.
Parking is for one car.

Questions

Can I book without LINE? Booking is through LINE. Phone calls are not taken. For questions, write to sauna@hace.jp.

How many people can come? Up to 4. Please give the exact number when booking, and tell us beforehand if it changes. You do not need to be a guest at Hace.

Do you rent swimsuits? No. Please bring your own.

Can I stay longer than 90 minutes? Yes. Book two slots in a row. That gives you 210 minutes for ¥9,600.

How do I pay? By credit card, charged automatically at 22:00 the day before.

How do I get in on the day? LINE sends instructions on the day.

Is there parking? One free space, on the temple side.

Can I use the sauna if I have tattoos? Yes. The sauna is private to your group, and guests with tattoos are welcome.

Combine it with your stay

Staying in Yumoto? See Iwaki Yumoto guide for how to combine the sauna with the public bath next door. Our places to stay: Hace rooms, Hace whole house, Hanare, Refugio del Café. For dinner and drinks: Kitchen Hace. A stay and a sauna booking are separate: the sauna is booked only through LINE.

Add on LINE to book

Email: sauna@hace.jp