Blade for a Long Sword ("Tachi")

太刀

At a glance — Swords & Armour · Kamakura period, 13th century · held by Tokyo National Museum · designated Important Cultural Property of Japan.

Fact Sheet

Designation: Important Cultural Property (重要文化財)
Category: Swords & Armour
Period: Kamakura period, 13th century
Date: 1201–1300
Held by: Tokyo National Museum
Location: Ueno, Tokyo
Catalogue ID: cobas-159149

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During the 1200s, the Yamashiro region south of Kyoto produced swords of refined craftsmanship. This blade by the swordsmith Sadatoshi is considered a masterpiece of the Yamashiro tradition. The white line along the cutting edge, the result of a meticulous steel-hardening process, reflects the light with exceptional clarity.

— Museum description: Tokyo National Museum (CC BY 4.0), via ColBase / Japan Search.

Record & Sources

Designation: Important Cultural Property (重要文化財), Government of Japan
Catalogue ID: cobas-159149 (permanent)
Official record: Japan Search — jpsearch.go.jp/item/cobas-159149
Holder's collection: ColBase — Tokyo National Museum
Photograph: Tokyo National Museum, via ColBase — CC BY 4.0. CC BY 4.0 licence
Credit as recorded: 渡邊誠一郎氏寄贈

Cite this page: “Blade for a Long Sword ("Tachi")（太刀）.” Treasures of Japan, catalogue no. cobas-159149. Tokyo National Museum. https://treasures.yamato-kenkou.com/treasures/blade-for-a-long-sword-tachi-159149/ — entry last verified 1 November 2026.

Full record data (as published in the official catalogue record)

Category: Applied arts:Arms and armor:Blades:Tachi
Genre: Arms & Armor
Cultural property designation: Important Cultural Property
員数: 1口
分類: 刀剣
種別: 工芸:武器・武具:刀剣:太刀
銘文等: 銘定利

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