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Sengokukogen Daihakoneichinoyu

仙石高原大箱根一の湯せんごくこうげんだいはこねいちのゆ

Pet-friendly Hakone ryokan with a private kakenagashi rotenburo

Lodging

Day Use

No

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

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

KidsWith Conditions

Welcomes children and families

未就学児まで混浴可

WashingYes

Shower, wash stations, soap and shampoo provided

ParkingYes

On-site or nearby parking available

仙石高原開発株式会社 供給温泉(新姥子温泉)

Sengoku Kogen Kaihatsu Supplied Spring (Shin-Ubako Onsen)

Operated by · 仙石高原開発株式会社

Mixed source

Simple
Color
colorless and clear
Taste
tasteless
Odor
very faint hydrogen sulfide
Hot source · 61°CHigh silica
Known good for
  • Aches & jointsstiff shoulders
  • Smooth skindry, rough skin
  • Recoveryfatigue, stress

A blended supply source (Shin-Ubako Onsen) drawing from six wells across Motohakone and Sengokuhara. A genuinely hot natural source (61 °C at the wellhead, served to bathers at 42 °C), classified as a simple thermal spring — lightly mineralized at 478 mg/kg of evaporation residue, weakly alkaline, and gentle on the body. A faint hydrogen sulfide note carries through, and a generous 162 mg/kg of metasilicic acid leaves the kind of silica film that gives skin a noticeably smoother feel afterwards.

Sampled at mixing tank·Analyzed Jun 19, 2014·一般財団法人 北里環境科学センター·Cert no. 神奈川県知事登録 第2号

Explore the water

About

A ryokan in Hakone's Sengokuhara area, part of the Ichinoyu group. The indoor baths use clear, skin-gentle spring water; outside, a small rotenburo (open-air bath) in a Japanese garden runs kakenagashi (free-flowing, non-recirculated) and can be reserved privately at no extra charge. Dogs are welcome throughout, including during meals.

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Reserve or check availability on a booking site.

SM
Sergey M
2 years ago

176. Sengokukogen Daihakoneichinoyu, Hakone Day-use bathing should be 1400 with a towel set + the receipt lets you visit other Ichinoyu locations in Hakone for free that same day (I got into this one for free using the receipt). Day-use hours are 13:00 to 20:00. Based on a sign — it's a dog-friendly place. Location isn't very convenient. One indoor bath. Clear water, hot+ temperature. Good air inside. Worth visiting if you're doing the Ichinoyu receipt run or happen to be right next to it. Otherwise can be skipped.

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Onsen Oni

Last updated September 19, 2026