Tama Sakai Tennen Onsen Mori no Irodori
Good to know before you go
- Getting there
- Tama-Sakai Station · 22 min walk (Keiō Sagamihara Line)
- Hours
- Weekdays 9:00–24:00; Weekends & holidays 7:00–24:00 (last entry 23:00). Closed 2nd Tuesday of March, June, September, and December.
- Admission
- Weekdays: ¥880 (adults), ¥450 (children 4–12), ¥100 (infants under 4); Weekends & holidays: ¥980 (adults), ¥500 (children), ¥100 (infants)
- Time needed
- 2–4 hours
- Best time to go
- Weekend mornings between 7:00 and 10:00 for the early morning bath; the official website notes peak crowding starts after midday on weekends and holidays.
Hours can change on holidays — check the official site before travelling.
About
Tucked away in Tokyo's Machida area, Mori no Irodori is a tranquil natural hot spring retreat surrounded by lush greenery that makes you forget you are in the metropolis. It is highly regarded for its mineral-rich, amber-colored 'Kuroyu' (black water) baths, authentic steam-saunas with auto-löyly, and open-air baths with forest views. Expect a modern, exceptionally clean facility featuring bedrock baths, massage services, and a traditional restaurant.
What Japanese guides note
Reaching Mori no Irodori on foot from Tama-Sakai Station takes over 20 minutes along an incline, so most non-driving patrons catch Kanachu bus line 76 from the station roundabout. Many local runners use the building as a staging station to change clothes before taking the adjacent green trail connecting toward Oyamadairi Park. Guests scan their locker shoe wristband to purchase food or vending items inside, settling the accumulated total at automatic payment machines before leaving.
Details from local sources
- The hot spring opened on October 1, 2020, on the former site of Ikoi no Yu Tama-Sakai and is operated jointly with Rakuya. [source]
- The facility pumps its amber-colored mineral water, named Sensui no Yu, from 1,700 meters underground as a sodium hydrogen carbonate and chloride spring. [source]
- The facility functions as a running station where visitors store baggage in lockers before jogging along the path to Oyamadairi Park. [source]
- The open-air section divides the spring into four separate pools: heated source water in atsu-yu and nuru-yu, alongside diluted kutsurogi-yu and nekorobi-yu. [source]
- Children who wear diapers are prohibited from entering the bathtubs and must use dedicated plastic baby tubs placed in the washing area. [source]
- The facility excludes anyone with tattoos, body stickers, or paint, and issues no entrance fee refunds upon removal. [source]
- The payment counters accept physical credit cards and transit IC cards but reject all barcode and QR payment methods. [source]
Insider Tip
Avoid weekend crowds by visiting on a weekday morning, and be sure to try the outdoor carbonated bath under the canopy of trees.
Frequently asked
How do I get to Mori no Irodori by public transit?
Take the Keiō Sagamihara Line to Tama-Sakai Station. From the station rotary, board Kanachu bus route 76 bound for Kanachu Tama Shako, alight at the Tamasakai-dōri Kita stop after roughly five minutes, and walk three minutes. Alternatively, walk 22 minutes directly from the station along the main road.
Are people with tattoos allowed to enter?
No. The facility enforces a strict ban on tattoos of any size, including temporary body paint and adhesive stickers. Staff will ask anyone found displaying tattoos inside the bathing or relaxation areas to leave immediately, and the facility does not issue admission refunds under any circumstances.
Can diaper-wearing children use the baths?
Infants and toddlers who still wear diapers cannot enter the communal indoor or outdoor bathtubs. Instead, accompanying guardians must bathe them in the dedicated plastic baby bathtubs provided in the wash areas. Infants under age four enter for ¥100, and mixed-gender bathing is limited strictly to preschool ages.
Can I bring my own food and drinks inside?
No. Bringing outside food or beverages onto the premises is prohibited for hygiene and sanitation reasons, nor can visitors take restaurant food off-site. Meals and refreshments must be purchased on-site from the first-floor Shunsatei restaurant or the second-floor Burari Chaya concession stall.
Are towels included in the entry price?
Towels are not included in the basic admission ticket. Guests can bring their own bath and face towels or purchase or rent them at the front desk: rental bath towels cost ¥180, souvenir face towels cost ¥140, and a combined towel set costs ¥300.
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