Kanagawa · Hakone Onsen
Hakone Kowakien Yunessun
箱根小涌園ユネッサン
Two halves: the swimsuit spa zone 'Yunessun' and the traditional nude 'Mori no Yu'. Wine baths, coffee baths and water slides make it family-friendly and an easy first onsen for visitors. Tattoos allowed if covered with a sticker. Dynamic pricing in 2026: passport (both zones) from ¥3,500, swimsuit zone from ¥2,500, Mori no Yu only from ¥1,500.
- Price (adult)
- ¥3,500
- Hours
- Yunessun weekdays 10:00–18:00 / weekends 09:00–19:00; Mori-no-yu 11:00–20:00 (last entry 1 hr before)
- Closed
- Irregular (maintenance closures)
- Access
- Hakone Tozan Bus to Kowakien
- Water type
- Simple spring
- Tattoos
- OK if covered
- Prices (dynamic)
- Yunessun (swimsuit zone) adults ¥2,500–3,000, children (3–elementary) ¥1,400–1,700 / Mori-no-yu (nude onsen) ¥1,500–1,800 / ¥1,000–1,200 / Passport (both) ¥3,500–4,000 / ¥1,800–2,000. Senior (65+) discount; under 2 free. Prices vary by date
- Rentals
- Swimsuit adults ¥1,200 (large sizes ¥1,500), kids from ¥700; rash guard ¥1,100; loungewear ¥200; bath towel ¥250; face towel ¥150
- Parking
- 2 hours free, then paid (¥1,600/day on weekends & peak days)
- Private baths
- Private open-air rooms in Mori-no-yu from ¥3,000/hr (2+ people, reservation)
- Phone
- 0460-82-4126
- Official site
- yunessun.com ↗
- Open in Google Maps
- Google Maps ↗
Essentials
Stay in this onsen town
Compare and book stays in Hakone Onsen. Day bathing itself needs no booking.
Opens partner booking site (affiliate)
Why go
- Swimsuit zone plus nude baths
- Wine bath and slides
- Tattoo stickers accepted
A swimsuit onsen theme park plus a real onsen
Opened in 2001 (25th anniversary in 2026), Yunessun in Kowakudani is a big onsen theme park in two zones. “Yunessun” is the swimsuit zone: the Mediterranean-style “Aegean Sea of the Gods” main spa, a wine bath where real red wine is poured from a 3.6 m bottle two or three times a day, coffee and green-tea baths, a 40 m panoramic rotenburo and the “Rockies Splash” water slide (height 105 cm+). “Mori-no-yu” is the gender-separated nude onsen with Japanese-garden rotenburo and a collagen bath (women’s), renovated in March 2025. The zones connect indoors, so you can walk between them in swimwear.
Tips & cautions
- Prices change by date and peak days may require reservations; buying on the official site saves up to ¥400.
- Frequent time-based deals: “Afternoon Pass” after 13:00, summer “Late Pass” after 17:00 (¥1,200 adults in 2025).
- Swimsuit required (rentals available); no swim cap needed. Check tattoo policy beforehand.
- Last entry one hour before closing.
- Buffet and Italian restaurants need no entry ticket; a food court serves guests in swimwear.
Getting there
From Hakone-Yumoto Station, Hakone Tozan bus (H line toward Togendai) ~20 min to “Kowakien”, right at the stop. About 20 min on foot from Kowakidani Station. By car ~30 min from Hakoneguchi IC.
Before you go
- Tattoos are fine if covered with a sticker sold at reception (size limits apply).
- Last entry is 30–60 minutes before closing.
Features
Rules & private
Who with
Convenience
Language support
✔ Verified operating: 2026-09 Operating status and rates cross-checked against the official site and onsen guides (full source notes in Japanese on the JA page)
Prices and hours change. Check official sources before visiting.
More in this area
Tenzan Tohji-kyo
Five minutes by shuttle from Hakone-Yumoto Station, a day-use-only bathhouse in the hills along the Sukumo River. Terraced rock rotenburo, a cave bath and a lukewarm pool invite long soaks. No reservation needed; rest rooms, restaurants and a reading lounge make it easy to stay half a day. Tattoos not permitted.
Hakone Yuryo
Three minutes by free shuttle from Hakone-Yumoto. A farmhouse-style day spa whose 19 private open-air rooms are the draw (reserve ahead). The löyly sauna sessions in the main bath are popular too.
Hakone-Yumoto Tenseien (day use)
A large day-spa 12 minutes from Hakone-Yumoto Station, open 23 hours (10 am to 9 am). A 17-metre rooftop open-air bath, garden waterfalls and private baths. Overnight stays cost extra.
