Iroha Maru Exhibition Hall: A Window into Sakamoto Ryoma's Maritime Adventure
Standing quietly by the harbor of Tomonoura — one of the most beautifully preserved Edo-period port towns in Japan — the Iroha Maru Exhibition Hall invites visitors to step back into one of the most dramatic episodes of the Bakumatsu era. Housed in a striking white-walled storehouse known locally as the "Okura" (Great Warehouse), this museum tells the story of the legendary Iroha Maru Incident of 1867 and the audacious negotiations led by none other than Sakamoto Ryoma, one of Japan's most beloved historical figures.
The exhibition hall stands just steps from Tomonoura's iconic Joyato stone lighthouse — a beloved symbol of the port town — making it an essential stop for anyone visiting this atmospheric corner of Hiroshima Prefecture.
The Iroha Maru Incident: A Turning Point in Japanese History
On the night of April 23, 1867 (May 26 by the Western calendar), the steamship Iroha Maru was sailing through the Seto Inland Sea when it collided with the Meiko Maru, a much larger warship belonging to the powerful Kishu Domain (present-day Wakayama Prefecture). The Iroha Maru was a 160-ton British-built vessel owned by the Ozu Domain of Ehime Prefecture, which had been leased to the Kaientai — a private naval trading company led by the famed samurai Sakamoto Ryoma.
After the collision, the Meiko Maru attempted to tow the badly damaged Iroha Maru to the nearby port of Tomonoura, but the ship sank along the way, taking all its cargo with it. Fortunately, all crew members had transferred safely to the Meiko Maru before the sinking.
What followed was a remarkable chapter in Japanese legal history. Ryoma and his Kaientai members landed at Tomonoura and spent four days engaged in intense damage negotiations with the Kishu Domain. In a groundbreaking move, Ryoma invoked "Bankoku Koho" — international maritime law — to press his case against the powerful domain. This incident is now regarded as Japan's first maritime arbitration case resolved through the application of international law. The Kishu Domain ultimately agreed to pay a compensation of approximately 83,000 ryo — an enormous sum equivalent to billions of yen in today's currency.
The Building: A Registered Tangible Cultural Property
The exhibition hall itself is a cultural treasure. The building is an Edo-period storehouse (kura) that was originally used by the Nakamura family — the wealthy merchants who held the monopoly on producing Tomonoura's famous Houmei-shu medicinal liquor. Known locally as the "Okura" (Great Warehouse), it features impressive architectural details including thick wooden beams, traditional namako-kabe (sea cucumber-patterned) plaster walls, and a commanding whitewashed exterior that reflects the prosperity of old Tomonoura.
The warehouse later passed into the ownership of the Ota family, prominent maritime merchants in the Meiji period. In 2000, it was officially registered as a national Registered Tangible Cultural Property by the Agency for Cultural Affairs, recognizing its outstanding architectural and historical value. The building was converted into the Iroha Maru Exhibition Hall when the museum opened in July 1989.
What to See Inside
The exhibition hall spans two floors, each offering a unique and engaging experience.
First Floor: The Iroha Maru Story
The ground floor is dedicated to the Iroha Maru Incident. Visitors can view artifacts salvaged from the wreck during five separate underwater archaeological surveys conducted between 1988 and 2004. These recovered items include ceramics, marble door knobs, metal ship components, and other fascinating remnants of the 19th-century steamship.
A large-scale diorama recreating the sunken Iroha Maru at approximately 70% of its original size provides a vivid impression of the vessel resting on the seabed. Photographs from the diving expeditions, illustrative panels explaining the collision sequence, and video footage of the underwater surveys bring the incident to life in compelling detail.
Second Floor: Ryoma's Secret Hideout
The second floor features a faithful recreation of the secret attic room in the Masuya Seiemon house where Ryoma stayed during his time in Tomonoura. During the negotiations, Ryoma used the alias "Saitani Umetaro" to avoid detection by the Shogunate authorities who were already targeting him. In the center of the recreated room stands a life-sized wax figure of Ryoma, crafted by Kochi Prefecture sculptor Okamoto Takeshi, holding a copy of "Bankoku Koho" — the very international law book he used to press his claims against the Kishu Domain.
This floor is a favorite photo spot for visitors. Ryoma fans can even try on period costumes and take photographs alongside the Ryoma figure — a memorable way to connect with this iconic historical personality.
Nearby Attractions: Following Ryoma's Footsteps in Tomonoura
The Iroha Maru Exhibition Hall is an ideal starting point for exploring the many historical sites connected to the Iroha Maru Incident and the wider heritage of Tomonoura.
- Masuya Seiemon Residence (Ryoma's Hideout) — The actual merchant house where Ryoma stayed during the negotiations. The attic room where he hid has been preserved and is open to visitors.
- Taichoro Hall at Fukuzen-ji Temple — The stunning temple guest hall where negotiations between the Kaientai and Kishu Domain took place. It offers a breathtaking panoramic view of the Seto Inland Sea, famously praised as "the finest scenery east of Tsushima."
- Ota Family Residence (National Important Cultural Property) — A magnificently preserved Edo-period merchant complex that once served as the headquarters of the Houmei-shu medicinal liquor business. Just a short walk from the exhibition hall.
- Joyato Stone Lighthouse — The iconic symbol of Tomonoura, built in 1859. Standing over 10 meters tall, it is the largest Edo-period stone lighthouse in Japan.
- Sensui-jima Island — A scenic island accessible by a short ferry ride aboard the "Heisei Iroha Maru," a vessel modeled after the original Kaientai ship. The island features walking trails, beaches, and hot springs.
- Enpu-ji Temple (Enpuku-ji) — Perched on the ruins of Okashima Castle, this temple served as the lodging for the Kishu Domain representatives during the 1867 negotiations.
Tomonoura itself is a designated National Important Preservation District for Groups of Traditional Buildings and a certified Japan Heritage site. The entire town retains its Edo-period layout, making it one of the most atmospheric historical port towns in Japan. It also served as the inspiration for Hayao Miyazaki's animated film "Ponyo on the Cliff by the Sea."
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Q＆A
- Is there English signage or explanations inside the Iroha Maru Exhibition Hall?
- The exhibition primarily features Japanese-language displays. However, the visual exhibits — including the diorama, salvaged artifacts, photographs, and video footage — are highly accessible and engaging even without Japanese language ability. Picking up a basic English guidebook or brochure at the Tomonoura tourist information center beforehand is recommended.
- How do I get to the Iroha Maru Exhibition Hall from Fukuyama Station?
- From JR Fukuyama Station (accessible by Shinkansen), take the Tomotetsu Bus bound for "Tomo-no-ura" or "Tomo-ko" from bus stop number 11. The ride takes approximately 30 minutes. Get off at the Tomo-no-ura Bus Terminal, then walk southwest for about 5 minutes to the harbor area. The exhibition hall is right next to the famous Joyato stone lighthouse.
- What are the opening hours and admission fees?
- The museum is open from 10:00 AM to 4:30 PM, currently on Fridays, Saturdays, Sundays, and public holidays. Groups of 10 or more may arrange weekday visits by prior reservation. Admission is 300 yen for adults, 230 yen for adults in groups of 30 or more, and 200 yen for elementary and junior high school students. Please check the latest information before your visit, as hours and days may vary.
- Is there parking available near the exhibition hall?
- The exhibition hall does not have a dedicated parking lot. Visitors arriving by car can use the municipal parking lot near the Tomo Castle ruins or the parking lot at the Tomonoura Museum of History and Folklore. Both are paid parking facilities located within walking distance of the exhibition hall.
- How much time should I plan for visiting the exhibition hall?
- A visit to the exhibition hall typically takes about 30 minutes. However, if you plan to explore the surrounding Ryoma-related sites and the historic Tomonoura port town as well, allow at least half a day to fully enjoy the area.
Basic Information
| Name | Iroha Maru Exhibition Hall (いろは丸展示館) |
|---|---|
| Address | 843-1, Tomo, Tomo-cho, Fukuyama City, Hiroshima Prefecture 720-0201, Japan |
| Phone | 084-982-1681 |
| Opening Hours | 10:00 AM – 4:30 PM (Fri, Sat, Sun, Holidays; weekday group visits by reservation) |
| Closed | Weekdays (except for pre-arranged group visits); Year-end and New Year holidays |
| Admission | Adults: 300 yen / Group (30+): 230 yen / Elementary & Junior High: 200 yen |
| Cultural Property Designation | National Registered Tangible Cultural Property (building, designated 2000) |
| Opened | July 1989 |
| Access | From JR Fukuyama Station: Tomotetsu Bus to Tomo-no-ura (approx. 30 min), then 5 min walk. By car: approx. 40 min from Sanyo Expressway Fukuyama-Higashi IC |
| Parking | No dedicated parking. Municipal parking lots available nearby (paid). |
References
- Iroha Maru Exhibition Hall – Fukuyama City Official Website
- https://www.city.fukuyama.hiroshima.jp/site/miryoku2023/288988.html
- Iroha Maru Exhibition Hall – VISIT Tomonoura (English)
- https://visittomonoura.com/2020/01/4770/?lang=en
- Iroha Maru Exhibition Hall – Dive Hiroshima (English)
- https://dive-hiroshima.com/en/explore/1608/
- Iroha Maru – Wikipedia (Japanese)
- https://ja.wikipedia.org/wiki/%E3%81%84%E3%82%8D%E3%81%AF%E4%B8%B8
- Iroha Maru Exhibition Hall – Tomo Monogatari
- https://tomonoura.life/spot/12673/
- Iroha Maru Exhibition Hall – Bingo Tokotoko
- https://bintoco.com/irohamaru-tenjikan/
- Fukuyama Tourism Information – Fukuyama Castle
- https://fukuyamajo.jp/commentary/en10/
Last verified: 2026.03.06