To further effectively protect against bounced stons by coating polymers of different materials and to reduce a total process cost by rigidly providing adhesive properties of a metal tube with a film-like thin film of a first resin layer.

An outer peripheral surface of a previously plated metal tube P is continuously coated with a thermoplastic first resin layer 2 made of a film-like thin film by extrusion molding while moving the tube forward, then supply of resin material in place in synchronization with the movement is interrupted, coating and polymerizing a thick thermoplastic second resin layer 2 by extrusion molding different from material of the interrupted first layer 1, thereafter cutting the interrupted part, and forming at least one end side as a chucking margin 3, thereby forming individual tubular members.