The kujira knife began with a practical request: a knife without a sharp point that children could safely use to sharpen pencils. The craftsmen in Tosa, Kochi Prefecture, set about making a prototype. When it was finished, someone noticed that the shape — the curved spine, the rounded tip, the way the handle met the blade — looked like a whale.
Tosa Bay is one of the best places in Japan to see whales. Sperm whales, minke whales, Bryde's whales, fin whales — they move through these warm Pacific waters, and whale watching has been part of Kochi's identity for generations. The resemblance to a whale felt right. The knife kept the shape. That is how the 鯨包丁, kujira bōchō, came to exist.
Where Tosa blades come from
Kochi Prefecture — historically known as Tosa — has been producing blades for over 700 years. The region's origins in blade-making are practical: Kochi's warm, rainy climate produces abundant timber, and the logging industry required tools capable of cutting through hard wood. In the late Kamakura period, around 1300 AD, sword smiths migrated from Yamato Province to Tosa, and their techniques merged with the existing tradition of forging agricultural and forestry knives. The result was a regional blade-making tradition with an unusual combination of influences — sword craft precision applied to everyday working tools.
What distinguishes Tosa blades is a practice called free forging — each craftsman carries out the entire process from raw metal to finished edge, rather than dividing the work between specialists. This gives the maker complete control over the blade's character, and keeps the work small-scale and personal. It also makes the knives more accessible in price than those produced by more divided processes, without sacrificing the quality of the work itself.
What the kujira knife is for
The kujira knife is a multi-purpose utility knife — compact, double-edged so it works equally well for right- and left-handed users, and made from high-carbon steel with a kurouchi black finish. The blade is forged from Shiroko White Steel, the same material used in professional Japanese kitchen knives, and holds an edge well.
At a desk: opening letters, slicing through cardboard, sharpening pencils in the way it was originally designed to do. Outdoors: cutting rope, preparing food at a camp, cutting fishing line. It is not a chef's knife. It is the knife you keep nearby for the tasks that come up without warning.
The different whales
Each knife in the collection is named after a whale species found in Tosa Bay — minke, Bryde's, fin, sperm — and the silhouette of each knife reflects the particular shape of that whale. The curved handle of the minke follows the dorsal fin of the male. The straight handle version follows the female's sleeker line. The sperm whale's block-shaped profile translates into a different blade geometry. They are individual objects that happen to make a set.
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