Former Nishihiro Family Residence (Jirokichi) Main Building

Nishihiro Residence Main House: Where an 1877 Merchant's Hall Meets a 1937 Cypress Wing

Look closely at the decorative alcove window in the guest room, and you will find the Inubosaki coastline carved into it. Waves, rock, the lighthouse above. The owner of this house put his own stretch of the Pacific into the joinery of his reception room, and most visitors walk past it without noticing.

The building is registered as 193 square metres of floor area, single-storey timber construction with a partial second floor, tiled roof. That is how Japan's Agency for Cultural Affairs records it. The figures suggest something modest. Inside, the reality is stranger: a low, wide merchant's hall from the 1870s, with an entirely different building grafted onto its back sixty years later.

The Nishihiro family arrived in Choshi from Kishu, in what is now Wakayama Prefecture, near the end of the Edo period. According to Chiba Prefecture's cultural properties division, the first generation ran a pawnbroking business and accumulated land taken as collateral, becoming a major landholder. It was the second generation who went to sea. His name was Jirokichi, and the family trade name comes directly from him. He fished for sardines, produced dried bonito, and for a period ran canning operations for sardine, saury and mackerel. When you see "(Jirokichi)" in parentheses in the official designation, that is the trade name, not a second family.

Two Buildings, Sixty Years Apart

The main hall, called the honkan, dates to roughly 1877 (Meiji 10). Choshi City describes it as single-storey timber construction with a hipped roof of sanmenkawara pantiles. It is the house of a family that had made real money from the sea, and it does not apologise for the fact.

In 1937 (Showa 12), two additions went up behind it. One is known as the sohinoki, the "all-cypress" wing, named for the hinoki cypress used throughout its rooms. The other is a Western-style annex. The Agency for Cultural Affairs singles out the contrast: a robust, plain-spoken merchant hall on one side, and behind it, rooms where the detailing turns fine and deliberate. The agency's assessment is that the combination shows clearly how a large modern merchant household actually lived.

Consider what those sixty years contained. In 1877 Japan was fighting the Satsuma Rebellion, its last samurai uprising. By 1937 the country was at war in China. Choshi's fishing fleet went from sail to engine in that span, and the processing sheds shifted from bonito flakes to canned fish. The main house absorbed those changes by growing rather than by being redesigned.

You can feel it underfoot. Corridor heights do not quite align at the joints. Floor finishes change where one era hands off to the next.

Registered, Not Designated: What That Means

On 27 March 2018, the main house became a Registered Tangible Cultural Property, registration number 12-243. On the same day the cannery, the north and south warehouses, and the brick wall on the property entered the register as well, five entries in total for one family compound.

The distinction between "registration" and "designation" matters in the Japanese system, and it trips up most foreign visitors. National Treasures and Important Cultural Properties are designated, which brings tight legal controls: alteration requires permission, and the state expects preservation to take priority over use. Registration is a different animal. Introduced in 1996, it works through notification rather than permission. An owner may alter up to a quarter of the exterior without seeking approval. The system exists because Japan was losing its modern-era buildings faster than the designation process could protect them, and because a building that cannot be used tends not to survive.

The main house was registered under the criterion of being a model of design quality. The cannery and the brick wall, by contrast, were registered under a different criterion, for contributing to the historical landscape of the country. Five properties, one registration date, three separate rationales among them.

The registered owner is Lance Co., Ltd. The Agency for Cultural Affairs database and Chiba Prefecture agree on this. Choshi City's own page lists the owner as privately held, which appears to reflect an earlier state of affairs.

What to Look For

Start with the tsukeshoin, the built-in writing alcove beside the guest room's main alcove. In a formal Japanese reception room, this is where the finest carving usually goes, and the Nishihiro house put a local seascape there rather than the pines or plum branches you would expect. The Inubosaki motif is specific to this coast and to no other place in Japan.

Then compare timber. Walk from the honkan into the cypress wing and look at the columns. Colour, grain, the way light sits on the surface: all different. Six decades of the family's fortunes are legible in the grade of the wood.

The Western annex arrives without warning after a run of tatami rooms. Reception rooms in Western style were not unusual for a prosperous 1930s household. What is telling here is that the annex sits within a few steps of a working fish-processing operation. The Nishihiro compound was a home and a workplace at once, and it never pretended otherwise.

North of the main house stands the cannery. Two warehouses, held by tradition to date from the Keio era of the 1860s, occupy raised ground to the east. A brick wall encloses the garden to the south. Seeing only the main house would leave four fifths of the compound unvisited.

Interior access is available on the second and fourth Sunday of each month, 10:00 to 15:00, with a heritage guide. Sessions are occasionally cancelled, so call the Choshi City cultural properties office at 0479-21-6662 before travelling. The exterior can be viewed on other days.