Izu Oshima by bus

Oshima Miharayama Summit Bus Guide

Mt. Mihara is one of Izu Oshima’s strongest bus-access landscapes: a real active-volcano setting that can be reached from port areas without renting a car. The practical plan is not just “go to the summit.” It is checking the latest bus timetable, volcanic information, weather, walking time, and return bus before you start.

Quick Answer

Use the Oshima Bus stop Miharayama Sanchoguchi. Oshima Town’s official Mt. Mihara page says the ride from Motomachi Port takes 36 minutes by the Miharayama Line, climbing bus, or Miharayama Sanchoguchi direction, with the bus stop right by the access point.

Oshima Bus’s sightseeing page lists Miharayama Sanchoguchi Observatory on the Miharayama Line and Rainbow Line, with a 1-minute walk from the Miharayama Sanchoguchi stop. Use the current Oshima Bus timetable before travel, because mountain-route timing matters more than the headline access time.

How Far To Walk

Oshima Town says the crater viewpoint is about 45 to 60 minutes on foot from Miharayama Sanchoguchi. The town page also says the ohachi-meguri crater loop opened in May 1998, making it possible to see the scale of Mt. Mihara close up.

Oshima Bus gives a fuller walking estimate from the summit entrance area: about 1 hour 30 minutes round trip to the crater viewpoint, plus about 40 minutes for the crater loop, for a total of about 2 hours 10 minutes. Build a return-bus buffer around that, not around the minimum walking time.

What You Are Seeing

Oshima Town describes Mt. Mihara as a 758m central cone inside the summit caldera. The town page says the current cone was born from the An’ei eruption that began in 1777, and that the summit crater is about 300m in diameter and more than 200m deep.

The same official page also gives the modern eruption context: the 1986 eruption began on November 15, and the November 21 fissure eruption led to the evacuation of all island residents for about one month. Keep that history in mind: this is a scenic destination, but it is also an active volcano.

Volcano And Trail Safety

As checked on August 21, 2026, Oshima Town’s volcano activity page said Izu Oshima’s volcanic activity was quiet and the volcanic alert level was 1, meaning visitors should remember that it is an active volcano. The page also says entry into the crater may be prohibited depending on conditions.

The same page states that, as of August 2010, areas within 600m of the summit crater and lava-flow hazard areas are restricted, except for trails and promenades. Stay on official trails, follow posted restrictions, and check the latest volcano and weather information before walking.

Bus Planning

As checked on August 21, 2026, Oshima Bus’s route-bus page showed a timetable period of July 1 to September 30, 2026 and linked the current route-bus timetable, island map, route map, fare table, and riding guide. Do not rely on a copied bus time from an old article.

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 may make sense if you combine Mt. Mihara with Oshima Onsen Hotel, Oshima Park, or port transfers.

Payment And Return Notes

Oshima Bus’s FAQ says Suica and PASMO are not accepted, while cash and PayPay are accepted. It also says on-bus change is available for 50 to 500 yen coins and 1,000 yen notes. Carry small cash and avoid planning around a last-minute payment assumption.

For this route, the real risk is missing the return bus after a slow walk, low cloud, strong wind, or a long photo stop. Check the last practical return before leaving the port area, and turn back early if conditions make the walking time stretch.

Before You Go Checklist

• Check current Oshima Bus timetables for Miharayama Sanchoguchi.
• Check official volcanic information and local restrictions.
• Plan at least the full crater-viewpoint walking time plus return-bus buffer.
• Bring weather protection, water, small cash, and a phone battery plan.
• Stay on official trails and respect closed areas.

Sources

• Oshima Town official Mt. Mihara page
• Oshima Town volcano activity 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, transport, volcano-safety, and source-image pages checked on August 21, 2026. Volcanic alert information, trail restrictions, weather, walking conditions, bus timetables, fares, payment rules, and route availability can change, so check official pages before travel.