A Meiji-Era Road Tunnel Through the Sashiki-Taro Pass
Sashiki Tunnel (佐敷隧道, Sashiki Zuidō, commonly called Kyū-Sashiki Tunnel or the Old Sashiki Tunnel) is a brick road tunnel 434 metres long bored through the Sashiki-Tarō Pass in Ashikita, Kumamoto Prefecture, completed in 1903 and listed as a Registered Tangible Cultural Property of Japan in 2002.
The approach gives nothing away. You leave National Route 3 near the coast, climb a narrow town road under overhanging cedar, and then the forest opens onto a wall of red brick with a semicircular arch cut into it. Nothing else out here is built of brick. The nearest sizeable town is fifteen minutes back down the hill.
Work began in 1901 and the tunnel opened to traffic at the end of May 1903. At 433.5 metres by direct survey, 5.5 metres wide and 4.4 metres high at the crown, it ranked sixth among Japanese road tunnels of its day and second in Kyushu. For a route that had defeated travellers since the Satsuma Kaidō highway era, that was a decisive change: the Sashiki-Tarō Pass tops out at 324 metres, and its gradients were once steep enough that local people preferred to travel by boat.
The tunnel stayed on the national highway until 1965, when the new Route 3 opened with the 1,570-metre Sashiki Tunnel and the old alignment was downgraded to a town road. It has carried local traffic ever since.
Why the Tunnel Was Listed
Japan's registration system, introduced in 1996, protects buildings and structures roughly fifty years old or more under three criteria. Sashiki Tunnel was listed on 21 August 2002 under the first of them, contribution to the historic landscape of the country, with the registration number 43-0050. The public notice followed on 3 September the same year.
What the assessors singled out was the portal masonry. Both ends carry a semicircular arch framed by brickwork laid in Flemish bond, known in Japan as Furansu-zumi, in which headers and stretchers alternate within every course. Around and above the arch sit dressed stone elements: a shield-shaped keystone, a coping along the top, a horizontal band course, and pilasters flanking each side. The stone is finished in the edo-giri manner, the face left slightly proud within a chiselled marginal draft, a technique carried over from castle and bridge masonry of the preceding centuries.
Inside, the bonding changes. The arch ring above your head is laid in stretcher bond; the vertical side walls use English bond, alternating whole courses of headers and stretchers. Three different bonds in one structure, chosen for three different structural jobs, in a tunnel built barely thirty years after brick construction reached Japan at any scale.
Who designed it remains unsettled. Contemporary accounts agree that a foreign engineer was brought in for the Sashiki and Tsunagi tunnels, but no name survives. Nihon Dōro Shi, published by the Japan Road Association, describes him as Dutch; Kumamoto Prefecture and the town history of Ashikita say German. The bricks themselves are said to have been made locally by a tile-maker who had moved to the old Tanoura area from Tokushima Prefecture.
What to Look For, and How to Get There
Give the portal a few minutes before you go in. The band course and pilasters read as a deliberate architectural composition rather than a piece of civil engineering, which is exactly the point: a national highway tunnel in 1903 was a statement about the modern state, and it was dressed accordingly. Moss has taken the lower courses. The brick colour shifts from rust to near-black where water tracks down.
Inside, sections of the original brick have been overlaid with concrete during later repairs, so the surface alternates between the two. Water seeps through and drips. Sound carries a long way. At the Satsuma-side entrance you can still see the ventilation installation added when motor traffic here was heavy, which dates the tunnel's second working life as clearly as anything else on site.
There is no lighting. Bring a torch if you intend to walk through, and expect the middle third to be genuinely dark, with a coin of daylight at the far end as your only reference.
The tunnel is on a public town road, so it is open at all hours and free of charge, and photography is unrestricted. Cars use it. The road is single-lane in places with a soft shoulder above a steep drop, and there is no dedicated car park, only informal space near the portal where you should not block through traffic. Drive slowly; deer cross here.
By road, take the Ashikita or Tanoura interchange on the Minami-Kyushu Nishimawari Expressway and follow the old Route 3 alignment; the drive from central Kumamoto City takes around ninety minutes. By rail, Sashiki and Kainoura stations on the Hisatsu Orange Railway are the closest, though you will need a taxi or car from there. Older guides refer to this line as JR Kagoshima Main Line, which it ceased to be in 2004.
Two other things nearby are worth the detour. The old Tsunagi Tunnel, 211.6 metres and built to the same design between 1899 and 1901, sits at the southern end of the same chain of passes and is also a Registered Tangible Cultural Property. And the ruins of Sashiki Castle, on the hill above the town, give you the coastal view that the tunnel builders were trying to reach.
- 📍 Plan Your Visit to Kumamoto
- Find tours, activities & transport passes near Sashiki Tunnel
- [ Kumamoto Castle & Mt. Aso Volcano Tours ]
Q&A
- Can visitors go inside Sashiki Tunnel, and is there an admission fee?
- Yes. The tunnel carries a public town road, so it is accessible at any hour with no fee and no reservation. There is no lighting inside, so a torch is advisable, and vehicles do pass through.
- How do I reach Sashiki Tunnel by public transport?
- Sashiki Station and Kainoura Station on the Hisatsu Orange Railway are the nearest railheads, but the tunnel sits several kilometres up a mountain road with no bus service, so a taxi or rental car is needed for the final leg.
- When was Sashiki Tunnel built and how long is it?
- Construction started in 1901 and the tunnel was completed in May 1903. The Agency for Cultural Affairs records its length as 434 metres and its width as 5.5 metres; direct survey gives 433.5 metres, with a crown height of 4.4 metres.
- Is photography allowed at Sashiki Tunnel?
- There are no photography restrictions, since the site is an open public road. Park where you will not obstruct residents or working vehicles, and take rubbish away with you.
- Who designed Sashiki Tunnel?
- The designer's name has not survived. Records agree that a foreign engineer was engaged, but sources disagree on his nationality: the Japan Road Association's history of Japanese roads says Dutch, while Kumamoto Prefecture and the Ashikita town history say German.
Basic Information
| Name | Sashiki Tunnel (佐敷隧道) |
|---|---|
| Location | Aza Tōge-shita, Ōaza Kainoura to Aza Hizoe, Ōaza Shiraiwa, Ashikita Town, Ashikita District, Kumamoto Prefecture |
| Designation | Registered Tangible Cultural Property (Structure); registration no. 43-0050; criterion: contribution to the historic landscape of the country |
| Year Designated | Registered 21 August 2002 (public notice 3 September 2002) |
| Quantity | 1 structure |
| Dimensions | Brick construction; length 434 m; width 5.5 m; crown height 4.4 m (survey figure 433.5 m) |
| Owner | Former Tanoura Town and Ashikita Town (both now part of Ashikita Town) |
| Public Access | Open at all times as a public town road; no admission fee; unlit interior; no dedicated parking |
References
- National Cultural Properties Database, Agency for Cultural Affairs — Sashiki Tunnel
- https://kunishitei.bunka.go.jp/heritage/detail/101/00003016
- Cultural Heritage Online — Sashiki Tunnel
- https://online.bunka.go.jp/heritages/detail/179236
- Japan Society of Civil Engineers, Western Branch — Old Sashiki Tunnel and Old Tsunagi Tunnel
- https://www.jsce.or.jp/branch/seibu/05_heritage/sasiki.html
- Ashikita Town Tourism Association
- https://ashikita-kankou.com/
Last verified: 2026.08.08