Seki City
Description
Seki City in Gifu Prefecture is the world capital of professional hair scissors. Learn why most premium Japanese shears come from this renowned blade-making region.
Seki City (関市, Gifu Prefecture)
Quick look
- Country: Japan
- Heritage: 1,200+ years of bladesmithing, originally swordmaking
- Output: Estimated 99% of Japan’s professional hairdressing scissors
- Steel standard: High-hardness alloys (58-65 HRC), convex hamaguri edge
- Production model: Division of labour (分業制, bungyosei) across specialist workshops
Why it matters
If you own Japanese scissors, they almost certainly came from Seki. The city sits along the Seki River in Gifu Prefecture, where the combination of clean water, quality iron sand, and charcoal from surrounding forests made it a natural center for blade work going back to the 13th century. Swordsmiths settled here first. When demand for swords declined, the skills transferred to knives, razors, and eventually scissors.
Today Seki is home to over 100 cutlery manufacturers. The city produces an estimated 99% of all professional hairdressing scissors made in Japan, with total production value around 12.45 billion yen. Major brands including Mizutani, Kasho (KAI Group), Joewell, Hikari, Yasaka, and Naruto all manufacture here or source critical components from the region.
The division of labour system
What makes Seki unusual is its bungyosei (分業制) production system. Rather than one factory handling every step, individual workshops specialize in single stages. One shop might handle forging, another grinding, another heat treatment, and another final assembly. A single pair of scissors can pass through five or more independent craftspeople before it’s finished.
This system developed over centuries and allows each specialist to reach a level of skill that would be difficult in a generalist factory. It also means two scissors from different “brands” may share some of the same workshop stages, which partly explains why some mid-tier Seki scissors punch above their price point.
Visiting Seki
The Seki Cutlery Hall (関鍛冶伝承館) offers public demonstrations of traditional forging. Several manufacturers maintain showrooms. Mizutani operates trial showrooms in Asakusa and Omotesando (Tokyo) and Osaka where stylists can test 200+ models before purchasing.
The sharpening distinction
Seki scissors use the hamaguri grind (蛤刃), a convex cross-section named after the clamshell it resembles. This is fundamentally different from the European Konvex-Schliff. Having your Seki scissors sharpened by someone trained only in European methods can cause permanent damage to the blade geometry. Always confirm your sharpener understands hamaguri technique before handing over Japanese scissors.
| See also: Ono City | Solingen | Steel Types |
Related guide: Manufacturing: Seki City Heritage
Seki by the numbers
Data from a 2017 Seki City industrial survey and regional sources:
- ~400 companies involved in blade manufacturing in Seki
- ~100 blade makers (メーカー)
- ~40 small-scale blade workshops
- ~210 subcontracting process specialists (pressing, grinding, polishing, heat treatment, assembly, buffing, plating, etching)
- ~50 parts manufacturers (molds, rivets, plastics, wooden handles, packaging)
- 50% of Japan’s kitchen knife production comes from Seki
The division of labor system (分業体制)
Seki’s manufacturing model is built on 分業体制 (bunyō taisei) — a specialized division of labor where different companies handle different manufacturing steps. A single pair of scissors may pass through 5-10 different specialist workshops before completion:
- Company A stamps the blanks
- Company B handles heat treatment
- Company C does the grinding
- Company D performs ura-suki (hollow grinding)
- Company E assembles and inspects
This contrasts with vertically integrated manufacturers like Mizutani (who control all steps in-house) and Kikui (who must process cobalt-base alloy entirely in-house due to the material’s difficulty). Both models produce excellent scissors — the quality depends on the skill at each step, not on whether one company or ten companies perform the work.
World’s Three Great Blade Cities
Seki is recognized as one of the “World’s Three Great Blade Cities” (世界三大刃物産地) alongside:
- Solingen, Germany — Protected “Made in Solingen” designation since the Middle Ages. Home to Jaguar, Tondeo, Dovo.
- Sheffield, England — Historic steel and cutlery center since the 14th century. Declined in the 20th century but retains heritage status.
Seki’s 800-year blade-making history began with swordsmiths in the Muromachi period and transitioned to scissors and cutlery in the modern era.
Verified Sources
- Primary 🇯🇵 Seki City — Tradition Page (Japanese)
- Tertiary 🇯🇵 刀剣ワールド (Touken World) — Seki History (Japanese)
Frequently Asked Questions
Seki produces an estimated 99% of Japan's professional hairdressing scissors — total production value around 12.45 billion yen — and houses over 100 cutlery manufacturers. Major brands including Mizutani, Kasho (KAI Group), Joewell, Hikari, Yasaka, and Naruto all manufacture here or source critical components from the region. The city's advantage traces back to 13th-century swordsmithing along the Seki River, where clean water, iron sand, and charcoal from surrounding forests made it a natural blade-working centre.
Bungyosei (分業制) is the production model where individual workshops specialise in single stages — one shop forges, another grinds, another handles heat treatment, another does ura-suki (hollow grinding), another assembles. A single pair of scissors passes through 5 to 10 different specialist workshops before completion. This system developed over centuries and lets each specialist reach a level of skill a generalist could never match. It also explains why some mid-tier Seki scissors punch above their price — they share workshop stages with premium brands.
Seki scissors use the hamaguri grind (蛤刃), a convex cross-section named after the clamshell it resembles, and it is fundamentally different from the European Konvex-Schliff. A Konvex-Schliff applied to a hamaguri blade will alter the blade geometry permanently because the underlying curve and ride-line geometry do not match what European belt-wheel technique is designed to service. Always confirm a sharpener understands hamaguri technique before handing over Japanese scissors — recovery from a wrong-method grind is expensive or impossible.