The present invention relates to a method of molding a
composite material structural member used mainly within structural members such as channel materials or angle materials, and also to a
composite material structural member. An object of the invention is to provide a method of molding a
composite material structural member that is capable of suppressing
fiber creasing even for very long shapes having non-developable surfaces, and also to provide a composite material structural member.When pressing a prepreg laminate against a molding die, the method comprises a preparation step of preparing a prepreg laminate for molding by laminating a plurality of prepregs with different
fiber orientations into a flat plate shape, and a pressure application step of pressing the prepreg laminate for molding prepared in the preparation step against the molding die, and in the preparation step, a specified prepreg having a
fiber orientation that coincides with, or is close to, the direction of creasing occurrence is split, either within the region of creasing occurrence or in the vicinity thereof, along a direction that is effective in inhibiting creasing occurrence, and the split prepreg is then used in preparing the prepreg laminate.