What is the difference between a nodachi and an odachi?
Updated Feb 2026
Nodachi and odachi are closely related terms that both describe extended-length Japanese great swords, and in most collecting contexts the terms are used interchangeably. Both refer to swords with blades significantly longer than the standard katana - typically 90 cm or more in the blade alone. Some historical texts distinguish between the terms based on specific blade length thresholds or historical periods of use, but in contemporary Japanese sword collecting the distinction is largely academic. Both nodachi and odachi collectibles share the same essential characteristics: extended blade length, full-tang construction, and the same proportional handle-to-blade relationship scaled up from the standard katana. Collectors who specify nodachi or odachi are identifying the same fundamental extended-format Japanese great sword, and the pieces in both categories share the same display requirements and aesthetic impact.