Usuba Knife: The Japanese Chef's Vegetable Knife

The usuba (薄刃, “thin blade”) is the professional Japanese vegetable knife. It is one of the three core single-bevel knives of Japanese cuisine, with the deba and the yanagiba, and apprentice cooks traditionally spend a long time learning it. Two regional styles exist: the square-tipped Edo usuba from Tokyo and the kamagata usuba from Osaka, which has a rounded tip.

Blade shape and geometry

An usuba is tall and rectangular, with a completely flat edge. It is thin at the edge, as the name says, but single-bevel, with one wide bevel on the front face and a hollow-ground back (urasuki). It is heavier and thicker at the spine than a nakiri, and taller, often 50mm or more.

The flat back and single bevel are what make it special. The back face rides perfectly flat against the food, so slices come off uniformly thin, and the knife can peel a daikon into a continuous sheet. The flat edge meets the board along its whole length for clean push cuts.

What it is for, and what it is bad at

The usuba does katsuramuki (rotary peeling into sheets), very fine julienne and brunoise, decorative cuts for garnishes, and paper-thin slices of cucumber or radish. In a Japanese restaurant it handles most of the vegetable work for precise, repeatable cuts.

It is bad for casual home chopping. The single bevel makes the knife steer through thick, hard vegetables like squash unless your technique is good, and the thin edge chips if you twist it. It has no point for trimming. And it is hard to sharpen well, since the flat back must stay flat. For everyday vegetable prep the double-bevel nakiri is easier in almost every way.

Common lengths and which to choose

For a first usuba, 180mm is manageable. Choose between Edo (square tip) and kamagata (rounded tip) by feel. The kamagata tip is a bit easier for detail work.

Bevel and handedness

The usuba is single-bevel and handed. Most are right-handed. Left-handed versions exist but are made to order, cost more, and take longer to arrive. See our single bevel vs double bevel guide for what that means in practice.

Steel recommendations

Usuba are a Sakai specialty, most often in Shirogami #2 or Aogami #2 on a soft iron body. Carbon steel sharpens to the extremely fine edge the knife needs. Vegetable acids will stain it, so expect patina and wipe it as you work.

For stainless, Ginsan is the standard choice, because it behaves on whetstones much like carbon. Entry usuba start around $150 to $250, and handmade Sakai blades go well past $500. Prices move with the yen. Our whetstone sharpening guide covers the flat-back technique.

The related knives on this page are nakiri, which suit most home cooks better than an usuba.

Who should buy one, and who should skip it

Buy an usuba if you are training in Japanese cuisine, work in a kappo or kaiseki kitchen, or want to learn katsuramuki and precision vegetable cuts, and you already sharpen on stones.

Skip it if you just want a great vegetable knife. A nakiri gives you the flat edge and clean chopping with none of the single-bevel learning curve. Most home cooks should skip it.

Compare with

• Nakiri: the double-bevel home version, easier to use and sharpen.
• Deba: the single-bevel partner knife for fish.
• Guide: Japanese knife types explained

If you want an usuba in a particular style or for left hand, ask us and we will quote it with duties included.