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Funabarakan

船原館ふなはらかん

Lodging
Chubu·Shizuoka

Day Use

Yes
¥800

Based on a single 2026 Google review describing a bathing visit and its fee (¥800); not published on the official site (no day-use page found) and not corroborated by an aggregator listing.

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Capabilities

Private BathYes

Private bath available for day-use visitors or hotel guests to reserve

The 立ち湯 (standing bath) used for the WATSU treatment is a reservation-only private bath.

Policies & Services

ParkingYes

On-site or nearby parking available

上船原温泉 船原3号

Kamifunabara Onsen Funabara No. 3

Operated by · 有限会社船原館

Simple
Color
almost colorless and clear
Taste
tasteless
Odor
faint hydrogen sulfide

Sodium-Calcium Sulfate-Chloride spring

pH 7.4NeutralHot source · 46°C
Composition fingerprint0.7 g/kg dissolved · Hypotonic
Na⁺78
Ca²⁺21
SO₄²⁻64
Cl⁻26
CationsAnions
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Sulfate SO₄²⁻
"gypsum / Glauber's salt" — vessels and wound healing.
Known good for
  • Aches & jointsstiff shoulders
  • Recoveryfatigue, stress

Hot (45.6 °C) simple thermal spring at Kamifunabara, with total dissolved solids of just 708 mg/kg keeping it inside the 'simple' classification despite a sulfate-dominant anion profile (about two-thirds of equivalent anions are SO₄). The wellhead pH of 7.4 sits squarely in neutral territory; the water reads as nearly colorless and clear, tasteless, with only a faint hydrogen-sulfide whisper. Lightly mineralized and gentle on the body, with a modest dose of metasilicic acid (37 mg/kg) softening the feel on the skin.

Sampled at wellhead·Analyzed Nov 8, 2019·株式会社サイエンス·Cert no. 第温191102号

Explore the water

Views

River

Highlights

Lukewarm Bath

About

Funabarakan is a small, older-style ryokan on the river in Izu's Funabara hot spring area. It has its own source, and the water comes out of the ground at just the temperature it's bathed at, so it reaches the tubs without being heated, cooled, or exposed to air along the way (the inn even feeds it in from the bottom of the bath to protect that freshness). Bathing is indoor and open-air, plus a separate reservation-only standing bath, tachi-yu (立ち湯), deep enough to stand in and fed straight from the source, built for a private water-shiatsu treatment (WATSU) done in swimwear. The inn calls its water Mono-wasure no Yu (物忘れの湯), the hot spring of forgetting. Guests describe an old building with a quiet, retro feel and dinners built around river fish and a wasabi hot pot.

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SM
Sergey M
1 year ago

250. Funabarakan, Izu Visited for higaeri at 800 (listed hours 13:30–16:00). I arrived earlier than the higaeri slot but they let me in, though they warned that the bath was being cleaned. There are several old and interesting onsen magazines in the lobby. They stamp the 60+6 Onsen of Shizuoka 24/25 booklet. The indoor bath was undergoing cleaning. This means natural water replacement by increasing the incoming water flow, so the water essentially replaces itself. Turned out to be an unexpectedly new experience and format. Clear water inside, temperature closer to the water source 43.5, a bit further away 43. Through the open window you could see the ryokan courtyard where someone was walking near a car. Outdoor bath with clear water, temperature 41. By default there's not much of a view, but if you stand up you can catch a bit of a shabby one. Getting the cleaning slot was pretty fun, but otherwise this seems like a place to skip.

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Last updated August 5, 2026