A Strongbox Dressed as a Shrine
In the grounds of Sanjō Shrine, in the Bisai district on the western edge of Ichinomiya, there is a building scarcely larger than a garden shed. It measures about 2.9 meters across the front and 2.3 meters deep, sits on a low podium, and wears a hip-and-gable roof of weathered green copper. At first glance it looks like a small shrine hall standing a step away from the main sanctuary. Walk up to it and the surprise arrives slowly: the timber-style brackets and rafters are not timber at all. The whole thing is reinforced concrete, cast in 1929 to imitate carpentry down to the last joint.
This is a hōanden. Before 1945, schools across Japan built these small, fireproof structures to hold two objects that the state treated as almost sacred: the goshin'ei, official photographic portraits of the Emperor and Empress, and a transcribed copy of the Imperial Rescript on Education of 1890, the document that defined the moral duties expected of every subject.
The building was completed on 30 November 1929 for Okoshi Second Ordinary Elementary School, today the municipal Sanjō Elementary School, and was paid for by the school's parents' support association. The principal unlocked its doors only a handful of times a year, on ceremonial dates such as Kigensetsu (the founding-of-the-nation holiday) and Tenchōsetsu (the Emperor's birthday), to carry the portrait and the rescript into the assembly hall. The rest of the year the doors stayed shut, and pupils were taught to bow deeply each time they passed.
How One Small Building Outlived an Era
Tens of thousands of these structures once stood in Japanese schoolyards. Almost none survive. After the country's defeat in 1945, the occupation authorities issued the Shinto Directive that December, separating the state from Shinto and from the cult that had grown around the Emperor. The Education Ministry followed on 29 June 1946 with an order to remove hōanden from schools, and across the country they were pulled down or quietly dismantled.
The Okoshi building escaped because local people moved it. The Imperial portrait had already been withdrawn from the school on 15 January 1946, and at some point afterward, most likely around 1947, residents shifted the little structure a short distance into the neighbouring Sanjō Shrine. The exact date was never firmly recorded. Standing among the shrine's own buildings, parallel to the main hall, it simply read as part of the shrine and was left alone while its counterparts elsewhere vanished.
That accident of survival is why it carries protection today. On 2 October 2007 it was added to the national register of Tangible Cultural Properties under the criterion recognising a structure as a model of its type. This is a lighter category than National Treasure or Important Cultural Property status; registration is the tier reserved mainly for buildings roughly half a century old or more that contribute to the historic character of a place. What makes this example valuable is its rarity. Very few hōanden remain anywhere close to their original condition, and fewer still are concrete ones executed in such complete traditional detail.
What to Look For
The fascination of the building lies in the gap between what it appears to be and what it is. The designer worked in the traditional shaku and sun units of old Japanese carpentry, then translated a wooden vocabulary into poured concrete. A horizontal nageshi tie-band runs around the walls. Boat-shaped funahijiki brackets sit on top of the posts. The single tier of eaves carries widely spaced rafters, the arrangement known as mabara-daruki. The gable is finished with a strut frame and a pendant in the shape of an inome, the heart-like "boar's-eye" cutout common in temple and shrine woodwork.
One absence is worth noticing. A true Shinto shrine roof is usually crowned with chigi, the crossed finials at the ridge ends, and katsuogi, the short logs laid across the ridge. This building has neither. The omission was deliberate. For all its shrine-like dress, it was a school building, and the designer stopped short of the marks that would have declared it a place of worship.
Inside, which is not normally open, the original wooden cabinet that once held the portrait and the rescript still stands in place. Built to the full height of the interior, floor to ceiling, with about twenty centimetres of clearance on either side, it has a pair of hinged board doors fitted with edge battens. Seeing the empty cabinet in its concrete shell is the closest a visitor can come to the strange devotional routine the building was made for.
Around the Old Post Town of Okoshi
Sanjō Shrine sits in a stretch of Ichinomiya that was shaped by the Kiso River and by the road that ran beside it. The nearby district of Okoshi was a post town on the Minoji, a connecting highway that linked the Tōkaidō at Miya (Atsuta) with the Nakasendō at Tarui. Travellers crossed the wide Kiso River here by ferry, and the town grew prosperous on that traffic and, later, on the woollen-textile trade for which the Owari plain became known.
The natural base for a half-day of exploring is the Ichinomiya Bisai Museum of History and Folklore, opened in 1986, which traces the life of the post town, the rise of the textile industry, and the changing course of the river. Its annexe is the former Hayashi residence, itself a registered cultural property: the family served as the post town's waki-honjin and as ferry administrators, and the house and its garden are open to visitors. A short walk away are the site of the old Okoshi river crossing and the remains of the post town's notice board. Art lovers can also visit the memorial museum dedicated to Migishi Setsuko, a pioneering woman painter in the Western style who was born in Ichinomiya.
The hōanden itself is not a developed tourist attraction. It is a quiet object in the corner of a working neighbourhood shrine, beside an active elementary school, and a visit takes only a few minutes. That modesty is part of its character: a fragment of a vanished school system, hiding in plain sight.
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Q&A
- Can I go inside the building?
- No. The interior is not open to the public and the structure now serves as a storehouse for the shrine. You can view the exterior from within the shrine grounds. Because this is an active shrine standing next to a working elementary school, keep visits brief and quiet.
- If it looks like a shrine, how is it different from one?
- It was never a place of worship. It was a school strongroom for the Emperor's portrait and the Imperial Rescript on Education. The designer borrowed shrine and temple forms but left off the crossed finials (chigi) and ridge logs (katsuogi) that mark a genuine Shinto shrine roof.
- Why build it in concrete if it imitates wood?
- Fire and earthquake. The portrait and the rescript were treated as objects to be protected at almost any cost, so many schools turned to reinforced concrete or brick for these structures rather than flammable timber. Here the concrete was simply finished to look like the carpentry it replaced.
- Is it a National Treasure?
- No. It is a Registered Tangible Cultural Property, a lighter level of national protection than National Treasure or Important Cultural Property. It was added to the register in 2007 mainly for its rarity and the completeness of its design.
- How do I get there, and what can I combine it with?
- The shrine is in the Bisai area of western Ichinomiya, reached by bus toward Okoshi from the Ichinomiya stations. It pairs naturally with the Bisai Museum of History and Folklore and a walk through the old Okoshi post town, which lie nearby in the same riverside district.
Basic Information
| Name | Former Okoshi Second Ordinary Elementary School Hōanden (Kyū Okoshi Daini Jinjō Shōgakkō Hōanden) |
|---|---|
| Location | 2 Kari, Sanjō, Ichinomiya City, Aichi Prefecture (precincts of Sanjō Shrine) |
| Owner | Sanjō Shrine |
| Designation | Registered Tangible Cultural Property (Building); registration no. 23-0253 |
| Date registered | 2 October 2007 |
| Built | 30 November 1929; relocated to the present site around 1947 |
| Count | 1 building |
| Structure | Reinforced concrete, copper-plate roof, building area about 6.7 m², on a raised podium; frontage about 2.9 m, depth about 2.3 m, hip-and-gable roof with gable-end entry |
| Access | Bus toward Okoshi from JR Owari-Ichinomiya or Meitetsu Ichinomiya station |
| Public access | Exterior viewable from the shrine grounds; interior not open |
References
- Cultural Heritage Online (National Institutes for Cultural Heritage): Former Okoshi Second Ordinary Elementary School Hōanden
- https://bunka.nii.ac.jp/heritages/detail/142528
- National Database of Designated Cultural Properties (Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00006766
- Aichi Prefecture Cultural Property Navigation: Former Okoshi Second Ordinary Elementary School Hōanden
- https://www.pref.aichi.jp/kyoiku/bunka/bunkazainavi/yukei/kenzoubutu/kunitouroku/1272.html
- Ichinomiya City: Cultural Properties within the City
- https://www.city.ichinomiya.aichi.jp/katsuryokusouzou/hakubutsukan/1044092/1024202/1036232.html
- Ichinomiya Bisai Museum of History and Folklore
- https://www.city.ichinomiya.aichi.jp/rekimin/
- Ichinomiya Tourism Navi: Bisai Museum of History and Folklore and the Okoshi post town
- https://www.138ss.com/spot/detail/78/
Last verified: 2026.06.16