The classification of Japanese swords

The classification of Japanese swords

The classification of Japanese swords (Katana and others) .

Japanese swords, collectively known as Nihontō (日本刀), are classified primarily by length, shape, and the period in which they were forged .

⚔️ Classification by Shape and Usage (Major Types)



Type Japanese Key Features Period / Role Blade Length 
Katana 刀 The most famous type. Curved, single-edged, worn with the edge facing up through the belt . Designed for cutting . Muromachi period (1392–1573) onwards. Primary weapon of the samurai . Over 60 cm (over 2 shaku) 
Tachi 太刀 Older style than the Katana. Generally longer and more curved, worn suspended from the belt with the edge facing down . Predominant before the 15th century; used by cavalry . Over 60 cm (often longer than katana)
Wakizashi 脇差 The short companion sword. Worn together with the Katana formed the Daishō ("large and small"), the symbol of the samurai class . Worn by samurai; also allowed for merchants and craftsmen. Used for close combat and seppuku . 30–60 cm (1–2 shaku) 
Tantō 短刀 A small knife-sized sword or dagger . Often carried by women and tradesmen for protection . Generally classified as a sword, but used as a knife . Under 30 cm (under 1 shaku) 
Ōdachi / Nodachi 大太刀 / 野太刀 Very large "great sword" or "field sword". Too long to wear at the waist; carried on the back or by hand . Used on the battlefield to break enemy formations, often from horseback . Over 90 cm 
Nagamaki 長巻 A sword with an exceptionally long handle, usually about as long as the blade . Evolved to be easier to handle than the Ōdachi . Variable
Naginata 薙刀 A polearm with a curved, single-edged blade. Despite being a polearm, it is forged like a sword and considered part of the Nihontō family . Used by foot soldiers (ashigaru) and later associated with warrior monks and samurai women. Variable

🏯 Classification by Shape (Blade Geometry)

  • Shinogi-Zukuri (鎬造): The most common style for Katana and Tachi. It features a ridgeline (shinogi) running along the blade, creating a flat plane that strengthens the blade and enhances cutting ability .

  • Hira-Zukuri (平造): A nearly flat blade without a ridgeline (shinogi). Often found on Tantō and some Wakizashi .

  • Moroha-Zukuri (諸刃造): A double-edged blade. Seen on very ancient swords (Tsurugi/Ken) and some transitional types like the legendary Kogarasumaru .

📜 Classification by Period

Japanese sword history is divided into specific periods based on forging techniques and style :



Period Name Meaning Era Characteristics
Jōkotō Ancient Swords Until c. 900 AD Straight swords (Chokutō), pre-cursor to curved blades .
Kotō Old Swords c. 900–1596 Considered the "Golden Age" of swordmaking. Development of the curved blade .
Shintō New Swords 1596–1780 After the decline of the older schools; more decorative, generally considered inferior to Kotō .
Shinshintō New New Swords 1781–1876 A revival movement attempting to recreate the techniques of Kotō .
Gendaitō Modern Swords 1876–Present Swords made after the Meiji Restoration and the ban on carrying swords .

🗡️ Classification by School: The Gokaden

In the Kotō era, there were Five Traditions (Gokaden) , each associated with a province and having distinct characteristics :

  • Yamashiro: Refined and elegant.

  • Yamato: Simple and strong, often made for monk warriors.

  • Bizen: The most prolific school, known for beautiful grain patterns and temper lines.

  • Sōshū: Innovative and robust, favored by the ruling warrior class.

  • Mino: Practical and famous for sharpness .

🎗️ Classification by Mountings (Koshirae)

How the sword is outfitted also defines its name and use :

  • Buke-zukuri: The standard mounting for Katana, worn thrust through the belt.

  • Jindachi-zukuri: Mountings for Tachi, worn suspended by cords.

  • Shira-saya: A plain wooden mounting used for storage and protection of the bare blade .

  • Guntō: Military swords from the Imperial era (WWII), often machine-made with Western-style mountings 

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