In a roll-to-roll step, an adhesive solution is applied to a release film 1 including a polyethylene terephthalate film and this film 1 is passed through a drying oven 500 regulated to 60 to 150° C. to thereby form an adhesive layer 2. Subsequently, an insulating film 3 including a polyimide film is laminated on the adhesive layer 2 at room temperature (about 25° C.) to thereby produce a layered product 6 including the release film 1, adhesive layer 2 and insulating film 3. Next, the release film 1 is stripped from the layered product 6 and a conductor film 4 including a copper foil is laminated to the adhesive layer 2 to thereby produce a conductor-clad laminate 8.