there is provided a process for producing a resin molded article , which includes the steps of : molding a thermoplastic resin to obtain a resin molded articles ; and flame - treating the surface of the resin molded article to obtain a flame - treated resin molded article ; wherein the process does not comprise after the step any further step of printing , adhesive - coating or painting the flame - treated surface of the flame - treated resin molded article obtained in the step .