A resin molded article and a production method thereof, including the processes of heat-molding a molding material containing a biodegradable resin and a reinforcing fiber or a biodegradable resin, a reinforcing fiber after controlling a water content thereof, or non-controlling. The housing includes an end wall turned away from a sieving unit and a peripheral wall formed with at least one chaff discharge opening. The interconnection substrate further has an insulating layer formed on the uppermost interconnection layer so that a gap is formed between the insulating layer and an outer peripheral surface of the resin film.