Tameshigiri — The Culture of Sword Testing

Origins and Significance of Tameshigiri

For a Japanese sword to be an excellent weapon, it required not only beauty and craftsmanship, but also "cutting ability" (kireasaji)—the actual capacity to sever objects. This empirical method of evaluating swords was called "tameshigiri" (sword testing) or "shitō" (sword testing). Though the practice of tameshigiri existed from ancient times, it was systematized as an institution during the early Edo period (17th century), becoming an officially sanctioned sword evaluation method conducted by specialized expert practitioners.

Materials and Methods of Sword Testing

Tameshigiri employed two main types of materials. One method, known as "dohanbawai" (cadaver testing), used the bodies of executed criminals at execution grounds. During the Edo period, it was an established convention that bodies of those executed at bakufu and domain execution grounds could be used for sword testing, and tameshigiri masters would visit the grounds to demonstrate their swords' cutting ability. The other method employed "straw bundles" (warataba) or "green bamboo" (aodake), which later became more widespread.

Results of tameshigiri were recorded as "tameshi-mei" (test inscriptions carved beneath the tang inscription). Notations such as "two-body severance" (nidō otoshi) or "three-body severance" (sandō otoshi)—indicating how many bodies (or bundles) could be severed in a single stroke—were engraved on the blade, functioning as a quality certificate for the sword.

The Yamada Asaemon Lineage and the Sword Testing System

The representative experts of Edo-period tameshigiri were the "Yamada Asaemon" lineage. The founder, Yamada Asaemon Sadatake, was active in the early 18th century and established a monopoly as an officially sanctioned sword testing master responsible for executions and sword testing at the execution grounds. The Yamada family, also called "Asaemon the Beheader," continued the sword testing profession for eight generations until the late Edo period.

The Yamada family were not merely sword testing practitioners but also excelled at sword appraisal and connoisseurship, authoring numerous sword evaluation treatises. The fifth-generation Yamada Asaemon Yoshimatsu, active during the Kansei era, was particularly learned and left multiple sword works, including the "Record of Swords for Military Use" (Buyō Tōken Roku).

Types of Tameshi-mei and Sword Value

Tameshi-mei directly determined a sword's market value. Swords that received ratings such as "dōta-nuki" (body-piercing)—capable of penetrating multiple torsos—were particularly highly valued. Test inscriptions recording results from specialized materials or circumstances also existed, such as "southern-barbarian iron testing" (nanban-tetsu tameshi) and "armor testing" (kacchū tameshi).

However, problems arose with later-period forgery and re-carving of tameshi-mei. From the mid-Edo period onward, authentication of tameshi-mei inscriptions became an important concern for sword appraisers such as the Honami family.

Tameshigiri after the Meiji Era

With the Sword Abolition Edict of 1873 (Meiji 6) and modernization of the criminal justice system, sword testing using actual bodies came to an end. In modern times, tameshigiri using bamboo bundles, tatami mats, and wet straw continues to be performed as a demonstration of iaido and battōdo, and as a means of verifying a sword's cutting ability, being preserved as one form of traditional sword culture.