Composite material molding method

A composite material molding method for molding a composite material by integrating a first fiber base material which is formed in a plate shape and a second fiber base material, the method comprising:

• an installation step of installing, in a recess formed in a first molding surface of a molding tool having the first molding surface extending along a longitudinal direction, the second fiber base material formed in a shape corresponding to the recess, a core portion or a bladder being inserted into a hollow portion of the second fiber base material;
• a fixing step of fixing a pair of end portions of a first fiber-reinforced portion in a width direction orthogonal to the longitudinal direction to the first molding surface to cover the recess in which the second fiber base material and either the core portion or the bladder are installed by the installation step, the first fiber-reinforced portion being a part of a plurality of fiber reinforced sheets included in the first fiber base material, and a pair of end portions of the second fiber base material being included between the pair of end portions of the first fiber-reinforced portion in the width direction;
• a lay-up step of laying up a second fiber-reinforced portion, which is the other part of the plurality of fiber reinforced sheets included in the first fiber base material, on the first fiber-reinforced portion fixed by the fixing step, the second fiber-reinforced portion having a larger number of layers than the fiber reinforced sheets included in the first fiber-reinforced portion, and the pair of end portions of the second fiber base material being included between the pair of end portions of the second fiber-reinforced portion in the width direction;
• and
• a molding step of molding the composite material by integrating and curing the first fiber base material and the second fiber base material installed in the recess using a resin material, wherein
• in the fixing step, the pair of end portions of the first fiber-reinforced portion is positioned on an outer side of the pair of end portions of the second fiber base material along the width direction to prevent the second fiber base material from contacting other members and moving in the lay-up step.