Bonito Tempura Main House

Katsuo no Tenpaku Main House: A Living Heritage of Katsuobushi Craftsmanship on the Shima Coast

Perched on the dramatic cliffs of Cape Daio in Shima City, Mie Prefecture, the Katsuo no Tenpaku Main House (かつおの天ぱく主屋) stands as a tangible testament to centuries of katsuobushi (dried bonito flake) production along the Pacific coast of Japan. Registered as a National Tangible Cultural Property in October 2022, this modest wooden building embodies the deep connection between the Ise-Shima region's fishing communities and the traditional food culture that has sustained Japan's culinary heritage since antiquity.

The building belongs to "Katsuo no Tenpaku," operated by Maruten Co., Ltd., a family-run katsuobushi producer now in its fourth generation. Here, the ancient art of smoking and drying bonito using the tebiyama (hand-fired) method continues to thrive — one of only about ten producers nationwide still practicing this Edo-period technique. Visitors who make the journey to this remote corner of the Shima Peninsula are rewarded with an extraordinary encounter with Japan's living culinary heritage.

Historical Background

The history of katsuobushi production in the Nakiri district of Daio Town stretches back to the Nara period (710–794), when the area was known as Shima Province, Isō District, Nakiri Village. Historical records indicate that katsuobushi — then called "katsuo" (堅魚), a primitive form of dried bonito — was produced here as an offering to Ise Grand Shrine. The Shima region was designated as a "Miketsukuni" (御食国), a province tasked with supplying food to the imperial court and the sacred shrines of Ise.

The tebiyama smoking technique, which Katsuo no Tenpaku preserves to this day, was perfected during the mid-Edo period. This method involves arranging bonito fillets on stacked bamboo trays (seiro) and smoking them directly over open flames of ubamegashi (Holm oak) firewood. The process is repeated over approximately one month until the moisture content drops to 18–20%, followed by three to four months of carefully controlled mold cultivation (kabitsuke) that further reduces moisture to just 1–2% while developing the rich umami flavor that characterizes authentic honkarebushi (fully finished dried bonito).

The Main House itself was constructed around 1951 (Showa 26), serving as both a residence for the katsuobushi-producing family and a workspace directly connected to the adjacent smoking facility. Its location was strategically chosen for its proximity to Nakiri Fishing Port, allowing freshly caught bonito to be processed immediately upon landing.

Why It Was Designated a Cultural Property

On October 31, 2022, the Katsuo no Tenpaku Main House was officially registered as a National Registered Tangible Cultural Property (building) by the Agency for Cultural Affairs. The designation recognizes several distinctive architectural and cultural qualities.

The building is a single-story wooden structure with a gabled roof covered in san-kawara (pantiles), with a total floor area of 54 square meters. Its exterior walls feature vertical board cladding (tateitabari), a practical design that helps the structure withstand the fierce Pacific winds that batter Cape Daio. The site is set lower than the surrounding cliff edge to the east and the road to the south, a deliberate positioning that provides natural protection from storms.

The official evaluation notes that this is a katsuobushi manufacturer's residence situated at Cape Daio overlooking the Pacific Ocean, ideally located where catches from Nakiri Fishing Port could be immediately processed. The southwestern four-tatami-mat room currently serves as a product display area, while the remaining spaces are used for storage. The building's form and construction reflect the practical needs and environmental challenges of a coastal fishing community engaged in traditional food production.

Together with the adjacent Workshop Building (作業場, also registered as a cultural property on the same date), the Main House represents a complete and rare surviving example of a traditional katsuobushi production complex — a type of structure that has become increasingly scarce as the number of traditional producers has dwindled to just a handful in the Daio Town area.

Architectural and Cultural Highlights

The Main House is characterized by its robust yet unpretentious construction, reflecting the functional needs of a working katsuobushi operation in a demanding coastal environment. The vertical board cladding is not merely an aesthetic choice but an engineering response to the powerful winds that sweep across Cape Daio from the open Pacific. The gabled roof with pantile covering represents a traditional roofing technique common to the region, providing durability against the elements.

The building's sunken positioning relative to the cliff and road creates a natural windbreak, while the compact 54-square-meter footprint reflects the efficient use of space typical of coastal production facilities. The interior layout, with its small tatami room now used for product display, offers visitors a glimpse into the modest living conditions of katsuobushi artisans who once resided alongside their workplace.

What makes this site truly exceptional, however, is the living heritage it represents. The adjacent ibushi-goya (smoking hut) remains a fully operational production facility where the tebiyama method is practiced daily. The underground fire bed, stacked seiro trays, and the carefully maintained mold-cultivation room (kabitsuke-goya) are not museum displays but active tools of a continuing craft tradition. The specific mold cultures that inhabit the kabitsuke room have been cultivated over generations, and it is said that these resident fungi are what ultimately determine the distinctive flavor of each producer's katsuobushi.

Visitor Information

Katsuo no Tenpaku offers guided tours of the ibushi-goya (smoking hut) on a reservation-only basis. The Standard Course lasts approximately 60 minutes and includes a firsthand experience of the tebiyama smoking process, an explanation of how honkarebushi is made, a discussion of the Miketsukuni food culture and its connection to Ise Grand Shrine, stories about Daio Town's identity as a "Town of Painters," a tasting of ichiban-dashi (first-extraction broth), and a sampling of freshly shaved katsuobushi over hot rice cooked in a traditional clay pot — a dish that has won praise even from Michelin-starred chefs.

Tour times vary by season: from October through May, sessions are held at 11:00 AM and 1:00 PM; from June through September, only a 10:00 AM session is available. The ibushi-goya is a working production facility, so tours may occasionally be unavailable even on scheduled days. Closed days include Wednesdays and Sundays, the Obon period (August 12–16), and year-end/New Year (December 1–January 10).

Admission fees are 2,000 yen for adults, 1,500 yen for middle school students, and 1,000 yen for children. Reservations can be made by phone at 080-2612-3801 (tour desk) or 0599-72-4633 (office, weekdays 9:00–17:00). For international visitors requiring interpretation, the Standard Course is extended to approximately 90 minutes. The tour has received the Omotenashi Selection Gold Award (Experience/Service category) and the Ministry of Agriculture, Forestry and Fisheries' "Shoku-kakeru Prize."

The business office is located at 2545-15 Nakiri, Daio-cho, Shima City (separate from the ibushi-goya), where products can be purchased on weekdays. The official website is https://katuobushi.com/.

Access

The ibushi-goya is located at 393 Ishihodani, Nakiri, Daio-cho, Shima City, Mie Prefecture 517-0603, approximately a 10-minute walk from the Daio-saki Lighthouse. By public transportation, take the Mie Kotsu bus bound for Goza Port from Kintetsu Ugata Station and alight at the "Daiozaki Todai" stop (approximately 20 minutes), then walk about 10 minutes. By car, the site is approximately 35 minutes from Shiraki IC on the Daini Ise Doro expressway via National Routes 167 and 260. Paid parking is available in the surrounding area (300–500 yen per vehicle).

Surrounding Attractions

The Katsuo no Tenpaku Main House is situated in one of the most scenic areas of the Shima Peninsula, offering numerous attractions within easy walking distance.

Daio-saki Lighthouse (大王埼灯台), just 10 minutes on foot, is one of only 16 climbable lighthouses in Japan. Built in 1927 to protect ships navigating the treacherous waters where the Enshu-nada and Kumano-nada seas converge, the white lighthouse offers panoramic views of the Pacific Ocean. An attached museum explains the history of the lighthouse and maritime navigation. Admission is 300 yen for adults.

Nakiri Shrine (波切神社) is home to the legend of "Dandarabocchi," a mythical giant said to personify the typhoons that frequently strike the area. The shrine's weathered torii gate and scenic pathway offer atmospheric photo opportunities. The nearby Hachiman-san Park provides an excellent vantage point for photographing the lighthouse.

The Nakiri district itself is known as the "Town of Painters" (絵かきの町) for its picturesque stone-paved lanes, traditional stone walls built by the renowned "Nakiri stone masons," and fishing village atmosphere that has attracted artists for generations. Pearl shops line the path from the fishing port to the lighthouse, reflecting the Shima region's status as the birthplace of cultured pearl farming. The town is also part of the Japan Heritage "Story of the Ise-Shima" designation.