Historical Evolution of Uchigatana Koshirae: Designs and Materials Chosen by Samurai from the Muromachi to Bakumatsu Periods

What is Uchigatana Koshirae? — Fundamental Differences from Tachi Koshirae

"Koshirae (拵え)" refers to the collective term for the entire external components of a Japanese sword — the scabbard (saya), grip (tsuka), guard (tsuba), and metal fittings. The blade itself (the sword proper) and the koshirae are originally separate entities, distinguished from the "shirasaya" (白鞘 — storage scabbard) used for blade storage.

"Uchigatana koshirae (打刀拵え)" is the koshirae designed for uchigatana (swords worn with the edge facing upward, thrust through the obi). It differs fundamentally from "tachi koshirae (太刀拵え)" (the scabbard and fittings for tachi, which are worn with the edge downward) in the following respects.

Differences in wearing style: Tachi are suspended from the waist belt and "haku (佩く)" (worn), while uchigatana are thrust through the waist belt and "sasu (差す)" (worn). This difference in wearing style determines the structure of the scabbard and metal fittings.

Scabbard structure: The scabbard of tachi koshirae has several suspension fittings called "ashi (足)." The scabbard of uchigatana koshirae has a protuberance called "kurigata (栗形)," through which a cord called "sageo (下緒)" is threaded to fix it to the waist belt.

Orientation of the tsuba: On tachi, the design of the tsuba is oriented so that it appears "upright when viewed from the front while being worn," whereas on uchigatana, the tsuba is oriented so that it appears "upright when viewed from the front while being worn."

Uchigatana Koshirae in the Muromachi Period — Establishment of Practicality

The Emergence of Uchigatana and Development of Koshirae

Uchigatana emerged in the mid-Muromachi period (15th century). Before this time, tachi were the primary swords of the samurai, but with the increase in infantry combat (shifting from mounted to foot combat) and the demand for portability, uchigatana — worn with the edge upward — rapidly became widespread.

Mid-Muromachi uchigatana koshirae were designed with practical use in mind. The standard scabbard was black lacquered (kurourushi-nuri), the grip was wrapped with shark skin (same-gawa — actually stingray skin) and bound with thread (silk or cotton), and the metal fittings were made of sturdy iron or copper alloys. Ornately designed fittings (tsuba, seppa, and menuki) existed, but not as luxuriously as those of tachi koshirae.

Mass Production and Simplification in the Sengoku Period

During the Sengoku period (15th–16th centuries), the massive demand for swords led to the simplification of koshirae as well. "Kazuuchi-mono (数打ち物)" — mass-produced swords — were paired with simple iron tsubas, plain scabbards, and straightforward grip wrappings.

Conversely, high-ranking samurai and daimyo commissioned lavish koshirae that were separate from the typical fittings mentioned above. This polarization was characteristic of Sengoku-era koshirae.

The Azuchi-Momoyama Period — The Integration of Martial Prowess and Beauty

The Age of "Magnificent Strength"

The era of Oda Nobunaga and Toyotomi Hideyoshi (late 16th century) was a unique cultural environment where "the beauty of tea ceremony and the grandeur of martial prowess" intersected. The influence of this era is evident in the koshirae of the time.

Luxurious koshirae featuring gold maki-e (gold powder lacquer painting), raden (mother-of-pearl inlay), and shu-urushi (red lacquer) on the scabbard came into fashion among the upper samurai class. For tsubas, the Azuchi-Momoyama preference for "large, powerful designs" prevailed, and the gold-copper chasing tsubas of the Goto family — featuring extensive use of gold, silver, and red copper — are typical examples.

Early Edo Period — Formalization of Status and Refinement of Materials

The Bakufu's Buke Shohatto and Regulation of Koshirae

The Edo shogunate regulated the lifestyles of samurai through the "Buke Shohatto (武家諸法度)." The specifications of swords and koshirae were also constrained by social rank, with different rules for the permissible size of tsubas, the materials of metal fittings, and the designs of scabbards among daimyo, hatamoto, gokenin, and townspeople.

Daimyo class: Luxurious koshirae such as Goto family red-copper granulation fittings and gold maki-e scabbards were permitted. The "daishogatari (大小揃い)" — a set consisting of an uchigatana and a wakizashi with matching koshirae designs — became the standard for formal occasions.

Hatamoto and gokenin: The standard was a practical black-lacquered scabbard, iron tsuba, and shark-skin wrapped grip. Austere, straightforward workmanship was considered a virtue befitting the samurai class.

Representative Koshirae Styles of Early Edo Period

Edo koshirae (江戸拵え): The standard uchigatana koshirae of Edo-period samurai. The basic composition consisted of a scabbard coated with black glossy lacquer (kuro-roiro-urushi), a grip wrapped with black and white thread around shark skin, and iron-based metal fittings. It embodied the practical and dignified character of the samurai class.

Higo koshirae (肥後拵え): A style of koshirae that developed in the context of the samurai culture of the Higo (Kumamoto) domain. It is characterized by metal fittings with gold and silver inlay (Higo inlay) on an iron base and a scabbard with ho-no-ki (Japanese magnolia) lacquer or seigaiha (wave pattern) lacquer. It embodied a rough-hewn and Zen-like aesthetic sensibility.

Genroku Culture — The Apex of Ornamentation

"Decorative Koshirae" Born in the Age of Peace

The mid-Edo and Genroku period (1688–1704) was an era of prolonged peace, when swords were valued more as art objects and decorative items than as martial equipment.

The decorative quality of koshirae reached its zenith, and the following styles came into fashion.

Maki-e scabbards: Koshirae with scabbards decorated throughout with lacquer maki-e paintings (depicting designs with gold and silver powder applied with lacquer). Designs of flowers and birds, landscapes, and scenes from The Tale of Genji were depicted.

Refinement of metal fittings: High-level carving and inlay were applied to tsubas, seppa, and menuki, and sets of fittings came to be valued as independent works of art.

Unified sword regalia: "Matched fittings" that unified the design of the entire koshirae became the standard for the upper samurai class.

The Late Edo Period — Return to Antiquity and Practical Use

In the late Edo period (late 19th century), with the rise of the sonnō-jōi (reverence for the Emperor, expulsion of barbarians) movement and the Bakumatsu Rebellion, there was a "return to practical swords." Koshirae also reflected this shift, with styles that suppressed ornamentation in favor of simplicity becoming preferred by samurai activists.

The style colloquially known as "kinnō koshirae (勤王拵え)" — featuring black-lacquered scabbards, plain iron tsubas, and practical grip wrappings — came into fashion. This was also a conscious return to the practically-minded koshirae of the early Edo period.

Conclusion — Koshirae as a Mirror of the Era

The evolution of uchigatana koshirae reflects the changes in samurai society like a mirror. The pragmatism of the Sengoku period, the integration of martial prowess and beauty in the Momoyama period, the formalization of the early Edo period, the ornamentation of the Genroku period, and the return to practicality in the late Edo period — the politics, culture, and values of each era are reflected in the design and material selection of koshirae.

When viewing a single piece of uchigatana koshirae, by reading the lacquer finish of the scabbard, the designs of the metal fittings, and the colors of the grip binding, one can discern "in what era and with what values did a particular person wear this sword?" Koshirae are the "storytellers" of sword culture.