PURPOSE: To prevent any damage to a conductive ceramics layer and also to control the generation of pinhole by forming a specified interlayer on the surface of a twisted wire, and forming the ceramics layer on the surface of the interlayer.

CONSTITUTION: On surface of a twisted wire 1 is formed an interlayer 2 having such gradient composition that is composed of A and Bx(A: transition metal IV/V groups. B: carbon, nitrogen and boron), and a twisted-wire side has x=0, an outermost-layer side has carbon, nitrogen has x=1 and boron has x=2. Then, a conductive ceramics layer 3 made of the transition metal IV/V groups is formed on the surface of the interlayer. The transition metal IV/V groups at this point have excellent conductivity so that the lightning surge resistance of an overhead power-transmission cable may be improved. Furthermore, metallic elements contact each other at the interface between the twisted wire 1 and the interlayer 2 while ceramics of same kind of composition contact each other at the interface between the interlayer 2 and the conductive ceramics layer 3, so that their interfacial affinities become excellent for improving each interfacial adhesion to ease any stress resulting from differential thermal expansion. This can prevent any damage to the conductive ceramics layer 3 while laminating these layers can also prevent the generation of a pinhole.