Omishima Island — Samurai Armor and Art Museums

Published: Jun 3, 2026

Updated: Jun 3, 2026

Omishimasamurai armorOyamazumi ShrineToyo ItoNational Treasure

Omishima Island — Samurai Armor and Art Museums

Omishima Island — Samurai Armor and Art Museums 2

Omishima Island — Samurai Armor and Art Museums 3

Omishima is the largest island on the Shimanami Kaido cycling route, home to Oyamazumi Shrine which houses Japan's most extensive collection of samurai armor and swords — over 80% of designated National Treasure arms and armor in Japan are stored here. The shrine's history dates to 594 CE, and for centuries warriors dedicated their armor to the shrine before battle, creating an unparalleled collection.

The island also features the Toyo Ito Museum of Architecture, a minimalist white structure designed by Pritzker Prize winner Toyo Ito, creating a unique juxtaposition of ancient and contemporary culture.

Opening Hours

Oyamazumi Shrine: 8:00–16:30 (treasure hall). Shrine grounds: always accessible. Toyo Ito Museum: 9:00–17:00.

Closed: Shrine treasure hall open daily. Toyo Ito Museum closed Mondays (Tuesday if Monday is a public holiday). Check for seasonal closure days.

Entrance Fee

Oyamazumi Shrine grounds: free. Treasure hall: ¥1,000. Toyo Ito Museum: ¥840. No combination ticket available between the two sites.

Best Season

Spring (April–May) and autumn (October–November) for best cycling weather on the Shimanami Kaido approach. Shrine ancient camphor trees are impressive year-round.

Visit Duration

Shrine + treasure hall: 60–90 minutes. Toyo Ito Museum: 45–60 minutes. Allow 2.5–3 hours for both sites plus transit between them. Half-day if cycling from Imabari.

Getting There

Access Information

Omishima Island, 40km into Shimanami Kaido from Imabari. Oyamazumi Shrine: free grounds, treasure hall ¥1,000. Hours: 8:00–16:30. Toyo Ito Museum: ¥840, 9:00–17:00, closed Mon. Cycling from Imabari: 2.5–3 hrs.

Insider Guide

Premium

**Armor collection significance:** The shrine's treasure hall displays armor worn by legendary figures including Minamoto no Yoritomo (first shogun), Minamoto no Yoshitsune (warrior hero), and multipl