What Is a Sushi Knife? | The One Blade You Actually Need

The term “sushi knife” gets thrown around loosely, but it’s not a single universal tool. Walk into a serious Japanese kitchen and you’ll find a quiver of specialized blades — each built for one task in sushi preparation. The yanagiba does the slicing a diner sees on the plate, while the deba handles the butchery you don’t. If you’re after that clean, glassy slice on sashimi or nigiri, the yanagiba is the blade.

What Makes a Sushi Knife Different From a Regular Knife

The difference starts at the edge. A traditional sushi knife — specifically a yanagiba — is single-beveled: sharpened on only one side, with the opposite side left flat or slightly concave. This design lets a thinner, sharper edge meet the fish with less resistance, producing a clean slice rather than a crushed tear. Common Western chef’s knives use a double-bevel V-edge, which is stronger but pushes the flesh apart more than it parts it. The single bevel also creates a natural urasuki (hollow-back grind) that reduces sticking, making each cut smoother than a double-bevel blade can manage.

Not Every Japanese Knife Is a Sushi Knife

Japanese knife taxonomy is precise, and using the wrong knife for the job can ruin both the fish and the experience. Here’s what the main types actually do:

• Yanagiba (270–300 mm standard): The primary sashimi slicer. Its long, narrow blade and single bevel are built for a single pull stroke through raw fish. A guide to the best yanagiba sushi knives can help you match size and steel to your cutting volume.
• Takohiki (300–330 mm): A Kanto-style sashimi knife with a squared-off tip, used similarly to the yanagiba. Its shape is traditional for slicing octopus and fish fillets in eastern Japan.
• Fugubiki (270 mm): A narrow, straight-edged knife made specifically for slicing the delicate, translucent blowfish sashimi (fugu).
• Deba (180–210 mm): A heavy, thick-spined filleting knife for breaking down whole fish and cutting through small bones. It is not a slicing knife — using a deba for sashimi will crush the meat.
• Usuba (210 mm standard): A thin, single-bevel vegetable knife used for precise cuts in Japanese cuisine. Not for fish.
• Sushi-kiri (240 mm): A rare double-bevel knife with a rounded tip, used specifically for dividing maki rolls into bite-size pieces without crushing the cylindrical shape.

Only the yanagiba, takohiki, and fugubiki are sashimi slicers. Calling every Japanese knife a “sushi knife” is like calling every screwdriver a hammer — they share a toolbox, not a job.

Does the Sushi Knife’s Handedness Matter?

Yes, and this catches more than a few buyers. Traditional yanagiba blades are ground from the right-side face, meaning the single bevel is on the right side when held edge-up. This makes it a right-handed knife. A left-handed user pressing a right-handed yanagiba through a cut will find the blade steering away from the intended line. Left-handed versions exist from many smiths, though they can cost more and may require special ordering. If you’re left-handed, confirm the grind orientation before buying.

Single Bevel vs. Double Bevel: Which Should You Pick?

This depends entirely on what you plan to cut. Traditional sushi knife guide—the yanagiba, takohiki, and fugubiki—is single-bevel because that geometry delivers the cleanest possible slice into raw fish. A double-bevel knife like a gyuto or a Western chef’s knife can still cut sashimi, but it will leave a slightly rougher surface because the edge meets the fish from both sides. For a home cook making the occasional sushi dinner, a quality double-bevel gyuto is more versatile and far easier to sharpen. For someone preparing sashimi weekly, a single-bevel yanagiba earns its spot. The trade-off is technique: single-bevel sharpening requires learning to maintain the flat side’s edge without rounding it.

Per Sakai Kikumori’s standard sizing, the yanagiba runs 270–300 mm — a range that balances control with single-stroke coverage for most fillet widths. Steel choice matters too: high-carbon steel holds a sharper edge but can rust without immediate drying, while stainless steel trades some edge potential for easier daily care.