METHOD OF MOLDING FIBER-REINFORCED PLASTIC

PROBLEM TO BE SOLVED: To provide a method of molding fiber-reinforced plastic capable of deforming an outer circumferential surface area of a core by increasing an internal pressure of the core without using pressurized gas or pressurized fluid when molding a molded article having a hollow part by a mold for molding.SOLUTION: A prepreg 3 in which a core 4 obtained by vacuum packing granules 4a is interposed is placed in a recess 1a formed in a lower mold 1 of a mold 15 for molding. When an upper mold 2 is lowered and the prepreg 3 is subjected to pressure molding between the upper mold and the lower mold 1, a piston rod 5a provided at the lower mold 1 protrudes in a cavity to press the core 4. By pressing the core 4 by the piston rod 5a, the outer circumferential surface area of the core 4 is extended, and a gap present between the core 4 and the prepreg 3 is dissolved.