Microcrystalline metal conductor and its manufacturing method

By reducing the difference between the size along the direction perpendicular to the grain size and the longitudinal direction along the longitudinal direction, thereby improving the flexural performance promotes isotropic refinement of the crystal structure fine a crystalline metal conductor 10 and a manufacturing method thereof, the material accumulated equivalent strain is strong processing which is 4 or more is applied, microcrystalline metallic conductor obtained by performing shaping machining, longitudinal average particle diameter B There at 10μm or less, an average particle diameter a of the direction perpendicular to the longitudinal direction has a crystal structure composed of crystal grains 12 is 2μm or less.