Onishi Family Residence Storehouse: A Showa-Era Dozo in Nahari's Historic Streetscape

Nestled along the charming streets of Nahari Town in eastern Kochi Prefecture, the Onishi Family Residence Storehouse (大西家住宅蔵) stands as an enduring testament to the region's rich commercial heritage. Built in 1938, this two-story earthen storehouse—known in Japanese as a dozo—was originally constructed by the predecessor of the Nahari Agricultural Cooperative. Today, it is a nationally Registered Tangible Cultural Property, recognized for its fine traditional craftsmanship and its role in preserving the distinctive architectural character of this once-thriving port town.

The History of Nahari and the Onishi Storehouse

Nahari Town has been an important transportation hub since ancient times. Mentioned as "Naha no Tomari" in the celebrated 10th-century literary work Tosa Nikki (Tosa Diary), the town flourished as a port for the shipment of Yanase cedar timber and later prospered through camphor production and silk reeling industries. Wealthy merchants and entrepreneurs built impressive residences and storehouses throughout the town, creating a distinctive streetscape that survives to this day.

The Onishi Family Residence Storehouse was erected in the early Showa period (1938) by the organization that would eventually become the Nahari Agricultural Cooperative. The building served as a vital storage facility for agricultural goods and supplies, reflecting the cooperative spirit that sustained the local economy. The storehouse is currently owned by Nahari Supermarket Co., Ltd., and continues to contribute to the town's remarkable ensemble of historic buildings.

Why It Was Designated a Registered Tangible Cultural Property

The Onishi Family Residence Storehouse was registered as a national Tangible Cultural Property (building) on October 18, 2000. Japan's registration system for tangible cultural properties was established in 1996 to provide broader protection for historic buildings that might otherwise be lost to development and modernization. Buildings that are at least 50 years old and that demonstrate notable characteristics of their era, outstanding design, or construction methods that would be difficult to replicate today are eligible for registration.

This storehouse meets these criteria through its well-preserved traditional dozo construction, its use of characteristic Tosa-region architectural elements, and its contribution to the historic townscape of Nahari. The building represents a valuable example of early Showa-period agricultural architecture in the Kochi region.

Architectural Features and Highlights

The storehouse is a classic earthen-walled structure (dozo-zukuri) spanning five bays in width (along the ridgeline) and three bays in depth. It has a gable roof (kirizuma-zukuri) covered with traditional san-gawara tiles, with the entrance on the long side (hirairi style). A lean-to (geya) extends approximately 2.7 meters from the south face, adding functional space to the building.

The west gable wall, which faces the road, is particularly noteworthy for its refined craftsmanship. The lower portion features horizontal weatherboarding secured with battens (oshibuchi shitami), while the upper section displays iron-shuttered windows flanked by mizukiri-gawara—the distinctive "drip tiles" that are a hallmark of Nahari's architecture. These projecting tiles were developed specifically to protect plaster walls from the heavy rainfall and typhoon-driven storms that frequently strike this coastal area. The eaves are finished with plaster applied all the way to the bargeboards (keraba), creating a clean, unified appearance.

The building's total floor area is 88 square meters, making it a substantial storehouse that speaks to the economic importance of agricultural commerce in the area during the prewar period.

Nahari's Historic Townscape: Walking Among Registered Cultural Properties

The Onishi Family Residence Storehouse is part of a remarkable collection of historic buildings in Nahari Town. The town boasts numerous nationally registered cultural properties, including the Onishi Family Residence Main House, Shogaku-ji Temple Main Hall, and the Fujimura Silk Reeling Company warehouse (also designated as a Modern Industrial Heritage site).

Strolling through Nahari's old streets, visitors encounter a captivating blend of traditional Tosa plaster walls, mizukiri-gawara drip tiles, stone walls built from beach pebbles (ishiguro), and red-brick storehouses and walls. Many of these historic buildings remain in active use as residences and storage facilities, lending an authentic, lived-in atmosphere that distinguishes Nahari from more heavily restored heritage districts. The entire walking course covers approximately 2 hours on foot, and local volunteer guides from the "Nahari Ura no Kai" group (active since 1999) offer informative tours of the townscape.

Surrounding Attractions

Nahari Town and its surroundings offer a wealth of experiences for visitors seeking to explore eastern Kochi Prefecture:

• Fujimura Silk Reeling Company Memorial Hall — A designated Modern Industrial Heritage site that tells the story of Nahari's once-flourishing silk industry.
• Takezaki Family Residence (former Takadaya) — A Meiji-era merchant house now serving as a Japanese-style café and gallery showcasing traditional furnishings and crafts.
• Nahari Furusato Kaigan (Hometown Coast) — A 1.4-kilometer seaside promenade with stone steps and brick walkways, perfect for ocean-side strolling.
• Coral Watching — The offshore breakwaters of Nahari harbor host rare coral colonies, viewable by glass-bottom boat tours.
• Monet's Garden Marmottan (in neighboring Kitagawa Village) — A stunning garden inspired by Claude Monet's garden at Giverny, accessible by bus from Nahari Station.
• Muroto UNESCO Global Geopark — Located further east along the coast, this geopark features dramatic coastal geology and deep-sea water facilities.
• Nonemayama Kaido — An ancient mountain trail dating to the Nara period (8th century), connecting Nahari with Toyo Town along a ridge route spanning 36 km with 1,000 meters of elevation change.