* Image is for illustrative purposes only.Muromachi Period — Overview of Japanese Swords, 1336–1573
室町時代の刀剣（概観）
Roughly 240 years under Ashikaga shogunate rule, marked by the shift from tachi to uchigatana and, after the Onin War, the rise of mass-produced kazu-uchimono blades.
Description
Historical Background
The Muromachi period spans roughly 240 years, from 1336, when Ashikaga Takauji established his shogunate in Kyoto, to 1573, when the 15th shogun Ashikaga Yoshiaki was expelled by Oda Nobunaga. The early period was relatively stable following the reunification of the Northern and Southern Courts in 1392, but the outbreak of the Onin War in 1467 rapidly eroded shogunal authority, plunging Japan into the Sengoku (Warring States) era. This political fragmentation and the surge in demand for practical weapons fundamentally reshaped both the style and production of Japanese swords during this era.
Characteristics of the Blades
In the early period, the tachi style inherited from the Kamakura and Nanbokucho periods continued, but as warfare shifted toward large-scale infantry combat, the uchigatana — worn edge-up at the waist — gradually became the dominant sword type. After the Onin War, mass mobilization centered on ashigaru foot soldiers became commonplace, and production centers such as Bizen Osafune actively manufactured standardized mass-produced blades known as kazu-uchimono. At the same time, production centers such as the Seki smith community of Mino Province developed distinctive forging methods emphasizing battlefield durability, and strongly regionalized styles emerged across the country.
Representative Smiths
Under Ashikaga Yoshimitsu, the Bizen Osafune school mass-produced kazu-uchimono blades as a leading export commodity in trade with Ming China, cementing its position as the foremost production center in western Japan. In Mino Province, smiths such as the first-generation Kanesada and first-generation Kanemoto rose to prominence, laying the groundwork for the practical sword lineage that would later culminate in the celebrated "Seki no Magoroku." Soshu-tradition techniques also continued to influence smiths across the country, serving as a vehicle for technical transmission throughout the Muromachi period.
Social Context
The Ashikaga shogunal house preserved renowned blades such as "Futatsu-mei Norimune" and "Onimaru Kunitsuna" as treasured heirlooms, positioning swords as symbols of samurai authority. At the same time, during the turbulent years following the Onin War, swords became essential equipment not only for samurai but also for the mass-mobilized ashigaru, and production systems for practical, battle-ready blades were established across the provinces. This expansion of mass production and battlefield demand shaped the sword culture of the following Sengoku period and laid the foundations for sword administration in the subsequent Edo period.
Characteristics of This Era
- Tachi predominated in the early period; after the Onin War, uchigatana and mass-produced kazu-uchimono became dominant
- Bizen Osafune led large-scale production of export swords for trade with Ming China
- Regional smith communities formed in Mino, Bizen, and other provinces, strengthening distinct local styles