Microcrystal metal conductor and method for manufacturing same

A microcrystal metal conductor (10) and a method for manufacturing the same, whereby the difference between the size of crystal grains in the longitudinal direction thereof and the size of crystal grains in the direction orthogonal to the longitudinal direction is reduced, isotropic size reduction in the crystal structure is promoted, and bend resistance is enhanced, wherein a microcrystal metal conductor obtained by applying a shaping process to a raw material subjected to high deformation with a cumulative equivalent strain of at least 4 has a crystal structure comprising crystal grains (12) having an average grain diameter (B) of 10 µm or less in the longitudinal direction, and an average grain diameter (A) of 2 µm or less in the direction orthogonal to the longitudinal direction.