Masamoto, Tokyo’s Professional Chef Standard
The knife brand most Japanese professional chefs were trained on. Tokyo-forged, carbon-steel-forward, minimum ceremony, maximum function.
Masamoto is what Japanese chefs use at work. Not a gift brand. Not a collector brand. A working tool with unmatched lineage.
Masamoto Sohonten has operated in Tokyo (in the Azumabashi/Sumida-ku area, near Asakusa, not Tsukiji) since the 19th century and has supplied Tokyo’s professional restaurant kitchens for most of that span. The KS series (Shirogami #2 carbon steel, wa-handle) is the single most-referenced professional-chef standard in Japan and commands cult status among serious enthusiasts. Not for beginners: carbon steel, requires care, and the pricing reflects five generations of unbroken craft.
“Masamoto” is not one company
This is the single most common point of confusion around the name, so we’ll be blunt about it. Masamoto (正本) is a historic Tokyo knife name shared today by several legally separate businesses. They descend from the same 19th-century lineage, but they are now distinct companies with their own management, workshops, product ranges and pricing. A “Masamoto” knife from one house is not made, guaranteed, or serviced by the other.
Note first what Masamoto is not: it is a Tokyo name. It does not belong to the Sakai (Osaka), Seki (Gifu) or Echizen (Fukui) cutlery regions that most Japanese knives come from. The heritage runs through the Matsuzawa/Hirano lineage in eastern Tokyo.
The two main houses trading as Masamoto today:
- Masamoto Sohonten (正本総本店), the older, “head-house” line, based in Azumabashi, Sumida-ku (near Asakusa, not Tsukiji, despite how often it’s described that way). It is the honyaki and professional carbon-steel house best known internationally for the KS series. It holds the registered MASAMOTO® trademark.
- Tsukiji Masamoto (築地正本), a separate company that, by Masamoto Sohonten’s own account, “set up business independently in 1951” and whose “products and company organization differ completely.” It operates from the Tsukiji outer-market area (with a Toyosu market counter) and runs its own catalogue and organization under the Hirano family.
Retailers, review sites and even the two companies’ own resellers routinely blur these together, calling Sohonten “Tsukiji Masamoto,” or attributing one house’s KS knives or history to the other. When you buy, check which Masamoto you’re actually buying: the maker, the address, and the trademark. The company profiles further down give the verified details for each.
The shared Masamoto heritage
The lineage traces to Minosuke Matsuzawa, reportedly born in 1845, who trained in Osaka in Japan’s honyaki (water-quenched, forged-from-steel) blade technique and, reportedly around 1866, began making cooking knives; the Tokyo business was established in what is now Azumabashi, Sumida-ku. Masamoto Sohonten reports being first in the Kanto region to manufacture and sell genuine tempered-blade cooking knives, and built its reputation supplying Tokyo’s professional restaurant and fish-market kitchens.
Over the following generations the name branched. In 1951, Tsukiji Masamoto was established as an independent company, by Sohonten’s own statement, with completely different products and organization. That is why today you find more than one legitimate business trading on the Masamoto name, each with its own claim to the heritage. Hedge any exact founding year with “reportedly”: the sources variously cite the founder’s 1845 birth, ~1866 first knives, and later formal establishment of the shop.
The house most enthusiasts mean by “Masamoto” for professional carbon-steel knives, and the maker of the famous KS series, is Masamoto Sohonten. The flagship KS is Shirogami (White) #2 carbon steel, wa-handle, kasumi lamination: a long-standing professional reference, not a decorative or Damascus knife. The product context below describes Masamoto Sohonten’s lines specifically.
The Masamoto product system
| Line | Steel | Purpose | Price Range |
|---|---|---|---|
| KS Series | Shirogami #2 (kasumi) | Professional reference; yanagiba, gyuto, deba | $280-$600 |
| VG Series | VG-10 | Stainless for commercial kitchens | $180-$350 |
| HC Series | Shirogami #3 / White #3 | Entry carbon professional knives | $200-$350 |
| Honyaki (by commission) | Single-piece hagane | Collector / master chef | $1,200-$3,500+ |
If you buy one Masamoto, it's most likely a KS yanagiba (for sushi work) or a KS gyuto (for general carbon-steel cooking). The VG Series exists for commercial stainless needs but is not what the brand is famous for.
The Masamoto buyer profile
Masamoto is for you if
- You cook professionally or at a high-amateur level and understand the rhythm of carbon-steel maintenance.
- You want the reference knife in its category, not the trendiest, not the most distributed, not the prettiest.
- You prefer a knife that disappears into the work rather than one that announces itself.
- You're willing to hand-wash, immediately dry, and periodically oil a carbon-steel blade.
Masamoto is not for you if
- You want a stainless, care-free Japanese knife for weekend home cooking, buy Shun or our Premium.
- You want a gift-ready knife with a decorative box. Masamoto's packaging is utilitarian.
- You want Damascus or tsuchime patterning. KS is classic kasumi, beautiful in a subdued way, not showy.
- You're shopping below $250. Masamoto's entry points start around there and go up.
Our picks from Masamoto
Masamoto KS 240mm Wa-Gyuto
The single most-referenced professional chef gyuto in Japan. Carbon steel discipline required. Outlasts careers.
Check on Amazon →Masamoto KS 270mm Yanagiba
The sashimi knife most Tokyo sushi chefs learn on. Single-bevel, pulled-cut only, patient to sharpen, perfect fish slices.
Check on Amazon →Masamoto VG 210mm Gyuto
For commercial kitchens wanting Masamoto's geometry without carbon-steel maintenance. Not the KS lineage, but Masamoto-made.
Check on Amazon →Masamoto KS 180mm Deba
The heavy-duty fish breakdown knife. Pairs with the yanagiba for whole-fish work. Professional sushi-bar gear.
Check on Amazon →Related terms
Masamoto Sohonten, Contact & Company Details
A working reference for this house. Details below are compiled from the company’s official website and public sources; confirm directly before relying on them for orders or visits.
Company details compiled from public sources and the maker’s official website; please verify directly before contacting or visiting. Fields marked “Not publicly listed” could not be confirmed at publication.
Tsukiji Masamoto, Contact & Company Details
A working reference for this house. Details below are compiled from the company’s official website and public sources; confirm directly before relying on them for orders or visits.
Company details compiled from public sources and the maker’s official website; please verify directly before contacting or visiting. Fields marked “Not publicly listed” could not be confirmed at publication.
Masamoto is the professional’s Japanese knife.
If you cook at a level where carbon-steel care is second nature, this is the canonical choice. If you want Japanese steel in a stainless, care-easy form, our Premium Damascus is honest at $199.
See the Okami Premium Damascus →