PURPOSE: To manufacture the excellent molded article having a smooth surface by a method wherein a plastic film is stuck to the inner surface of an injecting mold on the fixing side and then injection molding is performed.

CONSTITUTION: A 100μ thick polycarbonate film 70 is put on the surface F1 of a fixed force F and heated by a heater 22 at 200°C for 15sec. Then, high pressure air is sent from a high pressure air supplying device 23 and the film 70 is sutck instantaneously to the concave surface of the force F. A device 2 provided with the heater 22 and the high pressure air supplying device 23 is removed, a movable force M is fixed to the fixed force F and clamped at a high pressure. Molten composition material in which glass fiber is contained about 30% by weight is injected from the nozzle 3 of the injection molding machine into this mold to be filled with the glass fiber. After cooling, the molded article is taken out. The polycarbonate film is stuck integrally to the outer surface of the obtained molded article and no rugged flaws are found on the surface.