PURPOSE: To mold a void-free beautiful surface by extruding the resin in a prepreg to the surface thereof, by winding a prepreg sheet around a flexible tube and heating the whole in a mold before blowing compressed air into the flexible tube.

CONSTITUTION: After a prepreg sheet 4 is wound around a rubber tube 5 through which a core 6 is inserted for the purpose of reinforcement, the core 6 is withdrawn from the rubber tube 5 to bring said tube 5 to an easily bendable flexible state. This rubber tube 5 having the prepreg sheet 4 wound therearound is held and set between molds 7, 8. After the completion of setting, preheating treatment is performed by a heater to bring the resin 3 of the prepreg sheet 4 to a flowable state. At this point of time, curing treatment is performed under heating while compressed air is blown into the rubber tube 5 projected from the molds 7, 8 from one end thereof. The resin 3 made flowable by preheating treatment moves to the outer surface of the cylindrical wound article to expel internal air and a molded article having a void free beautiful surface is formed.