A manufacturing method and a manufacturing apparatus of an insulated wire

To provide a manufacturing method and a manufacturing apparatus of an insulated wire capable of producing high-quality anti-corona insulated wire at a low cost. In the manufacturing method A manufacturing the insulated electric wire D2, after the primary coating layer B is a conductor A on the primary coated electric wire D1 coated on and preheated to a temperature that is elevated adhesion of the resin to the primary coating layer B, the primary coating layer B of the preheated primary coated electric wire D1, for example, polyphenylene sulfide, etc. resin to form extruded resin, which secondary coating layer C made of PPS resin to produce an insulated wire D2 coated it is.