Abstract: A composite conductor 10, including an internal layer 11 having a conductive material A, the conductive material A having fatigue strength of at least 150 MPa after being subjected to 106 cycles of cyclic loading in a fatigue test, and an external layer 12 having a conductive material B, the external layer coating the internal layer 11, the conductive material B having tensile strength higher than that of the conductive material A, the tensile strength being at least 250 MPa, in which the composite conductor 10 has fracture resistance to a sudden load and impact as well as bending durability.

Abstract: A flexible conductive material and a cable using the same, being resistant to one million times or more of dynamic driving and particularly suitable for wiring robots or automobiles. An average crystal grain size of crystal grains 20 forming a metal texture of a base material is 2 ?m or less, in which the crystal grains 20 being 1 ?tm or less are included at least 20% or more in a cross sectional ratio. Also, it is preferable to include 0.1 mass % to 20 mass % of nanoparticles 22.