About Itsuo Doi
Son of legendary Keijiro Doi. Carries on the family tradition of forging at lower temperatures for superior steel quality. Blades favored by top Japanese chefs.
Itsuo Doi operates out of Sakai, Osaka Prefecture — one of Japan's most respected knife-making regions. As an independent master blacksmith, Itsuo Doi represents the high standards of craftsmanship that have made Japanese knives sought after by professional chefs and collectors worldwide. The forge, known as Doi Hamono, carries on a tradition of handcrafted excellence.
The primary knife specialties at Itsuo Doi include Yanagiba (the long, single-bevel sashimi knife essential for Japanese cuisine), Deba (the heavy-duty fish butchering knife designed for breaking down whole fish), as well as Usuba, Gyuto. Japanese knife shapes carry centuries of culinary heritage, each designed for specific cutting tasks. Single-bevel knives like the Yanagiba and Deba are used exclusively by professional Japanese chefs and require mastery to use effectively.
Itsuo Doi works primarily with Aogami #2. Aogami #2 (Blue Steel #2) is the most widely used blue paper steel in Japanese knife-making. It offers an excellent balance of sharpness, edge retention, and ease of sharpening. Slightly more forgiving than Aogami #1, it is the steel of choice for many traditional Sakai and Echizen smiths. Knives in Aogami #2 develop a beautiful patina over time. Additional steel options include Shirogami #1, giving buyers the option to choose based on their maintenance preferences and intended use. The choice of steel reflects the maker's philosophy: favoring high-performance carbon steels that reward proper care with outstanding cutting ability.
Traditional Japanese (Wa) handles are used exclusively — octagonal or D-shaped wooden handles that are lightweight, replaceable, and deeply rooted in Japanese culinary culture. Priced from $400 to $1500, these are elite, collectible-grade knives produced in limited quantities for the most discerning buyers.
For anyone looking to invest in a genuine Japanese knife from Sakai, Itsuo Doi is an essential name to consider. These knives are especially well-suited to professional chefs, dedicated home cooks, and knife collectors who understand the value of traditional Japanese craftsmanship. Carbon steel knives require drying after use and occasional light oiling to prevent rust — a simple routine that rewards the owner with exceptional performance.
Biography
Itsuo Doi is the son of the legendary Keijiro Doi, widely considered one of the greatest Japanese blacksmiths in history. Itsuo carries on his father's tradition of forging at unusually low temperatures — a technique producing superior grain structure in the steel and exceptional edge quality. His Yanagiba and Deba knives in Aogami #2 are benchmark tools for Japan's top professional sushi and kaiseki chefs. Doi's blades are produced in very limited quantities, and acquiring one often requires patience and dedication. For collectors seeking the pinnacle of Sakai's traditional single-bevel craft, Itsuo Doi represents an uncompromised standard.
The low-temperature forging technique practiced by Itsuo and inherited from Keijiro Doi is the defining technical characteristic of their work. By forging at temperatures below conventional practice, the steel's grain structure remains tighter and more uniform — a difference that manifests as superior edge quality and cutting feel in use. Aogami #2 is the primary steel, containing chromium and tungsten for improved wear resistance, reaching 62–64 HRC. Shirogami #1 is also used for Yanagiba work demanding the ultimate edge refinement.
The Yanagiba in Aogami #2 is a professional standard among Japan's most demanding sushi chefs. Its single-bevel geometry, hand-ground to exacting specifications, cuts sashimi with a pull stroke that minimizes cell disruption — a quality judges and masters describe as having a fundamentally different feel from ordinary knives. The Deba, used for breaking down whole fish, achieves the same standard in a heavier profile. These are tools that professional chefs build entire careers around.
Specialty Knife Types
Signature Knife Series
Doi's signature single-bevel sashimi knife, forged at low temperatures for superior steel structure. Used by Japan's top sushi chefs as their primary cutting tool.
Heavy fish knife forged to the same low-temperature standard. An essential professional tool for breaking down whole fish with precision.
Double-bevel chef's knife in pure white steel — an exceptional carbon steel cutting tool representing the pinnacle of Sakai double-bevel craft.
Steel Types Used
Aogami #2 (Blue Steel #2) is the most widely used blue paper steel in Japanese knife-making. It offers an excellent balance of sharpness, edge retention, and ease of sharpening. Slightly more forgivin...
Shirogami #1 (White Steel #1) is the purest form of high-carbon steel used in Japanese knives, containing very few alloying elements. This purity allows it to reach extreme hardness and take the sharp...