A manufacturing method of composite articles is provided by which it is possible to constantly mold thick composite articles as primary structure component parts for aircraft, such as rotor hubs of helicopters, which are highly accurate in dimensions and have a favorable internal quality with no internal defects such as molding cracks, voids and so forth. Therefore, this manufacturing method of composite articles includes the steps of laying up resin-impregnated reinforcing fiber materials in a molding cavity within a molding jig of a matched die type, evacuating the interior of the molding jig so that the resin-impregnated reinforcing fiber materials are under reduced pressure and thereafter closing and heating the dies of the molding cavity, causing the resin to overflow from the laid up materials into a trap located remote from the molding cavity, and molding the laid up materials inside of the molding jig.