Former Koyasu Family Main Building

A Merchant House on the Kameyama Castle Town Street

The Main House of the Former Koyasu Residence (旧子安家住宅主屋, also written Kyū Koyasu-ke Jūtaku Omoya) faces south onto Honmachi-dori in Kameoka City, Kyoto Prefecture, dates from the closing decades of the Edo period, and was entered on the national register of Tangible Cultural Properties on 6 August 2025.

Honmachi-dori is not an ordinary street. It runs through the castle town laid out around Kameyama Castle, the fortress Akechi Mitsuhide built in the 1570s as his base in Tanba, and it doubles as a stretch of the old San'in highway heading west out of Kyoto. Merchants, not samurai, lived along this section. The Koyasu family sold everyday household goods.

The Agency for Cultural Affairs dates the building to the late Edo period, between roughly 1830 and 1868, with a renovation in 2012. Its footprint is small at 89 square metres: timber, single storey with a partial upper floor, tiled roof.

Kameoka is a fifteen-minute train ride from Kyoto Station on the Sagano Line, and most travellers pass through it on the way to the Hozugawa river boats or the Sagano Romantic Train without stopping. The castle town is the reason to stop.

Low Eaves, Lattice, and the Argument for Registering It

The registration criterion applied here differs from the usual one. Rather than being cited as a model of design, this building was registered under the criterion of contributing to the historic landscape of the nation (国土の歴史的景観に寄与しているもの). That distinction matters: the case rests on the street, not on the individual house.

The Agency's description reads as a compact inventory of Kyoto townhouse vocabulary. The form is tsushi-nikai, a low attic storey above the ground floor, under a gabled roof entered from the gable end, with pantiles throughout. The ground floor front carries degoshi, a projecting lattice screen. The upper level opens with mushiko-mado, the plastered lattice openings named for their resemblance to insect cages, with a small pent roof beneath.

Inside, the northern strip was formerly a toriniwa, the earth-floored passage running the depth of the plot from front door to rear. To the south four rooms line up in a row, and the northwest room is fitted out as a formal zashiki with a tokonoma alcove.

The phrase the record keeps returning to is that the building stands low. Eaves height is a reliable indicator of age in townhouse architecture, and buildings from the later Edo period sit noticeably lower than their Meiji successors. Walking Honmachi-dori, the difference between the older and newer frontages is visible without measuring anything.

One feature the Agency's description does not cover is the ranma transom panel in the guest room, carved with the Eight Views of Omi. Local accounts hold that it, along with sliding-door paintings finished in gold dust, came from Kameyama Castle when the castle was dismantled in the Meiji period. This is a local tradition rather than a documented provenance, and it should be treated as such.

Visiting: This One You Can Actually Enter

Unlike most registered houses, this building is open, because it works for a living. The Kameoka City Tourism Association runs it as the Castle Town Historic Streetscape Information Centre, and it operates as the machiya café Honmachi Cafe. Ordering a coffee is the admission fee.

Opening hours are 10:00 to 17:00, shortening to 16:00 from December through February. It closes on Tuesdays and Thursdays, though it opens on public holidays outside the December to February period, and it closes over the New Year. Hours are subject to change and worth confirming before travelling. The tourism association can also be reached at its JR Kameoka Station office.

Take a table in the rear zashiki if one is free. The small garden beyond it uses garden stones of a kind not typically seen in central Kyoto townhouses, which is a quiet reminder that Kameoka is Tanba rather than Kyoto proper. Photography of the interior should be checked with staff, as it is a working café rather than a museum.

The site is roughly a fifteen-minute walk from JR Kameoka Station. Sanga Stadium by Kyocera sits beside the station, and the Kameyama Castle site is a short walk from the house, which makes a half-day loop straightforward: castle ruins, castle-town street, café, station.

The property has no listed owner in the Agency's record, and the ownership field is left blank there.