Craftsman
土佐廣次
Hirotsugu Tosa
The story
Hirotsugu Tosa (土佐廣次) was a knife sharpener (研ぎ師) in Sakai. He died in 2025; the national register of traditional craftsmen records him working in the craft since 1967.
Aoki Hamono, the maker behind the Sakai Takayuki brand, lists him on its own roster among its sharpeners and as a 伝統工芸士, with his specialty given as honyaki sharpening and mirror sharpening (本焼研ぎ・鏡面研ぎ).
The national register records his signature technique as mirror finishing (鏡面仕上), his main products as Japanese knives (和庖丁), and his certification as a traditional craftsman (伝統工芸士) in FY1990, general category, under Sakai forged cutlery (堺打刃物).
For a time he also sharpened a special run of Sakai Takayuki Hien knives for Knives and Stones; that arrangement has ended.
The Knives & Stones take
I was lucky to visit Tosa-san a few times over the years. What stays with me is watching him at his mirror polishing — bringing a blade to a finish that seemed to hold the light. A rare skill, and a rare thing to see up close. Rest in peace, Tosa-san.
— James Zhang, Knives and Stones
In photographs
Stills from our video of Tosa-san at work in Sakai
The relationship map 職人系譜
Masters, family, and the brands between them. Every line is a verified fact from our research. Tap a node to light up its connections and read its story.
Frequently asked questions
Who was Hirotsugu Tosa (土佐廣次)?
Reviewed by James Zhang
What was Hirotsugu Tosa known for?
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Was Hirotsugu Tosa a certified traditional craftsman?
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Did Hirotsugu Tosa work with Sakai Takayuki?
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