Izu Oshima by bus

Oshima Onsen Hopping by Bus Guide

Izu Oshima has three practical hot-spring choices for bus-based travelers: the port-side convenience of Gojinka Onsen, the seaside open-air feel of Hama-no-yu, and the mountain-side setting of Oshima Onsen Hotel. The right one depends less on which bath sounds best and more on your port, bus timing, weather, swimsuit plan, and closure checks.

Quick Answer

If you want the easiest bus-and-bath plan, choose Gojinka Onsen from Motomachi Port. If you specifically want an outdoor seaside soak and have a swimsuit, consider Hama-no-yu, but check wind and weather. If your day is already built around Mt. Mihara or the Miharayama Line, Oshima Onsen Hotel can fit well, but it is the most timetable-sensitive of the three.

A realistic onsen-hopping day is usually one main bath plus one optional second stop. Trying to force all three into one day can turn a relaxing island plan into a bus timetable exercise.

Compare The Three Stops

Gojinka Onsen: The Safest Base Choice

Oshima Town lists Island Center Gojinka Onsen at Motomachi aza Nakanohara 1-8, about 5 minutes on foot from Motomachi Port. Oshima Bus also lists Gojinka Onsen via the Oshima Park Line, Habu Port Line, and Miharayama Line, using Motomachi Port as the stop and a 5-minute walk.

As checked on August 21, 2026, the town page listed hours of 6:30 to 21:00 on days when overnight ferries arrive and 9:00 to 21:00 on days without overnight ferry arrivals. It listed regular closures on Thursdays and the second Wednesday, with February, March, and August variations. Basic admission was listed at 710 yen for adults and 300 yen for children.

Gojinka Onsen is also the best first choice if you want a less weather-exposed fallback. The official page lists baths, sauna-related spaces, a 25m hot-spring pool, rest areas, a shop, and a restaurant area. For pool use, it asks users to wear a swimming cap and says swimsuit rental is available for 300 yen with a deposit.

Hama-no-yu: Best When Weather Cooperates

Oshima Town lists Hama-no-yu 3 minutes on foot from Motomachi Port. Its official page lists hours of 13:00 to 19:00, with July and August hours of 11:00 to 19:00. It says the bath is open year-round, but may close or shorten hours because of weather.

This is the important difference: Hama-no-yu is not an indoor public bath. The official page says it is mixed bathing, so swimsuits are required. It also says there is no indoor bath and that showers are available in gender-separated changing rooms. Oshima Bus adds that the facility faces the coast and may close because of strong wind or bad weather.

Oshima Onsen Hotel: The Mountain-Side Option

Oshima Bus lists Oshima Onsen Hotel on the Miharayama Line and Rainbow Line, at the Miharayama Onsen stop, 0 minutes on foot. The bus page describes it as around 500m elevation on Mt. Mihara’s outer rim and lists the bath fee as 800 yen.

The hotel official bath page says day-use bathing is available, with fees of 800 yen for adults and 400 yen for children as checked on August 21, 2026. It lists day-use hours of 6:00 to 9:00 and 13:00 to 21:00, and warns that entry restrictions may apply when crowded. The hotel top page had a closure notice for October 5 to October 9, 2026, with operations restarting from 13:00 on October 10, 2026.

One-Day Route Ideas

For a simple arrival-day route, use Motomachi Port, store or carry your luggage plan, bathe at Gojinka Onsen, then add Hama-no-yu only if the weather is calm and you have a swimsuit. This keeps walking short and avoids depending on a mountain bus connection.

For a Mt. Mihara day, treat Oshima Onsen Hotel as the bath attached to the mountain side of the island. Pair it with a short summit-area visit only if the Miharayama Line or Rainbow Line works in both directions and the hotel has no closure issue. If the mountain weather looks poor, switch back toward Motomachi and use Gojinka Onsen instead.

For a bus-pass day, map every ride first. As checked on August 21, 2026, Oshima Bus listed one-day passes at 2,500 yen for adults and 1,250 yen for children, and two-day passes at 3,800 yen for adults and 1,900 yen for children, valid on all routes. A pass is useful only when your actual route uses enough buses to justify it.

Payment And Practical Notes

Oshima Bus’s route-bus page showed a timetable period of July 1 to September 30, 2026 when checked, with current timetable and route-map files linked. Use those files rather than a copied time from an old itinerary.

The Oshima Bus FAQ says Suica, PASMO, and other IC cards are not accepted. Cash and PayPay are accepted, and on-bus change is available only for 50 to 500 yen coins and 1,000 yen notes. For baths, bring small cash, a towel plan, and a swimsuit plan if Hama-no-yu or the Gojinka pool is on your list.

Deeper Facility Guides

• Oshima Gojinka Onsen by Bus Guide
• Oshima Hama-no-yu by Bus Guide
• Oshima Onsen Hotel by Bus Guide

Before You Go Checklist

• Check the current Oshima Bus timetable for your travel period.
• Check each facility’s latest hours, closures, fees, and entry rules.
• Use Gojinka Onsen as the easiest Motomachi backup.
• Use Hama-no-yu only with a swimsuit and acceptable weather.
• Use Oshima Onsen Hotel only when the mountain route and hotel status both fit.

Sources

• Oshima Town official Gojinka Onsen page
• Oshima Town official Hama-no-yu page
• Oshima Onsen Hotel official site
• Oshima Onsen Hotel official bath page
• Oshima Bus sightseeing information
• Oshima Bus route-bus timetables, maps, fares, and passes
• Oshima Bus FAQ
• Izu Oshima Photo Studio source image and terms

Editorial disclosure: This guide was prepared from official town, hotel, transport, and source-image pages checked on August 21, 2026. Facility hours, closures, admission, bath rules, pool rules, restaurant operations, route-bus timetables, fares, pass sales, payment rules, weather closures, and mountain-route availability can change, so check official pages before travel.