PURPOSE: To enhance the flexibility and bendability of the wire material as well as to reduce the size thereof, by providing an organic doner molecule layer onto the outer periphery of a conductor core wire and thereby doping acceptor molecules or ions to enable the preparing of the long wire material with any diameter from several millimicrons to several tens of millimicrons on continuous process steps.

CONSTITUTION: A layer 2 of organic doner molecules such a as bits (ethylene dithio) tetrathiafurvalen, tetramethyl tetraselenafurvalen, etc., is applied, by deposition, CVD method, or the like, to the outer periphery of a conductive core wire 1 which consists of an organic conductor such as a metallic or electrically conductive high polymer, a carbon conductor such as a graphite fiber, or glass fiber with a conductive film. Next doping of acceptor molecules or ions is performed, using a process of electrolysis, or a process of gas phase, with respect to the resulting wire. At this time, trihalide such as I2-, IBr3-, etc., or halogen atoms such as AuI2- are used as the acceptor molecules or ions. As the occasion demands, thereafter, an external reinforcement layer 3 which is composed of an insulator or conductor is provided on the resulting wire.