Shunmokutei Nakazawa Ryokan
四万温泉 春木亭 なかざわ旅館
Area photo — not the ryokan itself · The Shima River at Shima Onsen, Gunma · Kentaro Ohno / CC BY 2.0
A six-room hillside inn where all four baths are free-flowing, free and lockable for your party alone — no shared bathing at all — with home-style local cooking in semi-private rooms, from about ¥30,000 for two
Nakazawa opened in 1973 as a minshuku, became a ryokan in 1991 and took its present name, Shunmokutei Nakazawa Ryokan, in 2018; its own timeline lists more than ten rebuilds, the latest in April 2022. Today it's six Japanese rooms in hinoki-rich wooden interiors, two of them with their own free-flowing bath. The draw is the bathing: there are no shared baths at all. The hexagonal-window view bath, a storehouse-style kura bath, a hinoki barrel open-air bath and the mountain-hut open-air bath Kōya-no-yu are all free and unbooked — lock the door and the lamp shows it's taken. The inn describes every bath as 100% free-flowing, its 78°C chloride-sulphate source blended from several springs to cool it rather than diluted. Most recent evidence comes from booking-site reviews: the one 2022 stay blog found is brief, but Japanese guests rate it 4.83 across 713 reviews on one major site — service 4.89 and baths 4.87, location the lowest at 4.58 — and 4.86 across 13 on another, with dozens of dated 2024–2026 reviews. They praise a cheerful, attentive okami, rooms cleaned with care, the house cheese-filled ganmodoki, Jōshū beef cooked on a ceramic plate, generous portions and rarely meeting another guest. The complaints are small but consistent: a narrow approach road and a tight, first-come car park; steep slopes and many stairs inside; no hairdryer in some rooms and weak dryers at the baths; cooking some call homely or plain; and the odd lukewarm room bath, musty towel or cramped washbasin (2024–2025). Two-meal plans start around ¥29,700 for two, about ¥36,000–40,000 with a private-bath room.
Room Selection Guide
What the guests who stayed here actually recommendRecommended
Suishōan (水晶庵), the detached annex with a private open-air bath
A separate building of about 14 mats in natural woodland, with the inn's signature open-air bath of hinoki and natural stone, fed free-flowing. A June 2024 guest loved the big windows framing flowers and green hills, and July 2026 guests praised a large tub they could use at any hour plus dinner and breakfast in a private room. The kabuki actor Nakamura Kanzaburō (then Kankurō) stayed here for three days, the inn says.
Daisen-no-ma (大仙の間) with a wooden-hut hinoki bath
A 10–12-mat room (the inn's pages differ) with its own hinoki 'wooden hut' bath of free-flowing onsen, where you can hear the trees and birds, the inn says. May 2026 guests said the room bath let them soak to their heart's content, and an October 2024 guest called it a very good room. Plans run about ¥35,900–39,900 for two with two meals.
Request To Avoid
Standard Japanese rooms on 'room left to the inn' plans
The four standard rooms (6-mat pairs to 15 mats) have a toilet and washbasin but no bath, so you rely on the four private baths — fine on most nights, though a June 2024 guest couldn't get into all four. Guests note lots of stairs to reach rooms (2024), a cramped washbasin with little shelf space (February 2025) and no hairdryer in the room (August 2026). The upside: an October 2026 guest got two connected rooms, and several call the rooms spotless.
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Dining Deep Dive
Breakfast Consensus
4.5/5A country-style set breakfast with the inn's hearty bean-and-vegetable miso soup, millet rice and egg-on-rice, served in the same semi-private dining area — guests praise the rice and the miso soup
Choose a plan with dinner and breakfast in a private room if privacy matters; otherwise tables are screened by noren curtains. Lock a private bath as soon as its lamp is off — the barrel bath and Kōya-no-yu close at 22:00 and reopen 5:00–9:30, while the view and kura baths stay open overnight. You can leave the car after check-out and walk the onsen street, and the inn lends bear bells for night walks.
Dinner Insights
4.6/5The seasonal 'Hatago gozen' from 18:00 in semi-private or private rooms, built on Gunma produce: the okami's cheese-filled ganmodoki (the family once ran a tofu shop), Jōshū beef grilled on a ceramic plate with mushrooms in autumn 2026, pork steamed in onsen water, tempura of local vegetables, udon and local Koshihikari rice. Guests in 2025–2026 call it delicious and filling — too much for some — and drinks reasonably priced. Gripes: 'healthy or, put badly, cheap' (2024), too many carbs to go with drinks (2026), the same menu on a repeat visit, no draft beer and no printed menu.
Onsen & Wellness Realities
The inn's own blended source, Iwabumi-no-taki-yu: a colourless chloride-sulphate spring (neutral, hypotonic, pH 6.9) at 78°C, piped from several natural outlets. The inn says all baths are free-flowing and that it adjusts temperature by mixing sources of different temperatures, without adding water. Guests found it soft and warming; some found a bath slightly hot, others lukewarm, and one December 2024 room bath stayed lukewarm even when stirred. The water is not licensed for drinking in the inn; a public drinking fountain sits at the foot of its steps.
Four private baths, all free and unbooked: the hexagonal-window view bath looking over Shima's mountains (shown on TV Asahi's Tabi Salad), the monochrome storehouse-style kura bath Shinsen-no-yu with an old-inn changing room, the hinoki barrel open-air bath Iwashimizu, and Kōya-no-yu, a mountain-hut open-air bath up the hill. Hours: 15:00 to 9:30, with the barrel bath and Kōya-no-yu closed 22:00–5:00. Kōya-no-yu's view has been altered by weir construction since August 2024, the inn notes. Guests love having the water to themselves; one wished a bath had more of a view.
No policy found on the official site or Japanese booking sites — contact the inn. Every bath is private and lockable, so you never share with other guests.
Local Warnings & Nuances
- 01
Check-in 15:00–18:00 (some plans to 17:30), check-out 10:00. Dinner is from 18:00; call if you'll arrive later — without word by 19:00 the inn may discard the meal.
- 02
The inn sits on a slope with a gradient in front of the lobby and many stairs inside; ask for a room near the baths if stairs are hard.
- 03
Free parking for about eight cars, first come first served, partly covered, about 8 m past the inn up a narrow lane — several guests in 2024–2025 struggled to park, so a large car is a challenge.
- 04
There's no drugstore or convenience store in Shima Onsen; the inn's fridge has drinks and you're welcome to chill your own. Pets aren't allowed; children are.
- 05
Private baths are first come — on a full night you may not get into all four. The official site's rate tables date from 2021; check current plans on booking sites.
Before your stay
Souvenirs from Shima Onsen and practical help for your trip.
Shima Onsen souvenirs on Rakuten
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Sources
The real blog posts and stay reports this article draws on
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Photo credits
- Sekizenkan — the Honkan and the red Keiun Bridge, Shima Onsen · Kentaro Ohno / CC BY 2.0
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Photo credits: The Shima River at Shima Onsen, Gunma · Kentaro Ohno / CC BY 2.0 / Sekizenkan — the Honkan and the red Keiun Bridge, Shima Onsen · Kentaro Ohno / CC BY 2.0 / Steam rising over the Kirishima hot springs, with Sakurajima beyond · 663highland / CC BY 2.5
Shunmokutei Nakazawa Ryokan
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