Method and device for molding fiber-reinforced plastic member

A method for molding a fiber-reinforced plastic member having a longer dimension in a longitudinal direction than in a direction perpendicular to the longitudinal direction, the method configuring:

• a first molding jig which is a mold for molding a fiber-reinforced plastic material and has multiple pieces adjacent to one another in the longitudinal direction;
• and
• a second molding jig which is formed of a material having a linear expansion coefficient approximate to the linear expansion coefficient of the fiber-reinforced plastic, and which aligns the pieces of the first molding jig along the longitudinal direction, wherein the method comprises:
• a first molding jig disposing step of disposing the pieces of the first molding jig with a gap between one another;
• a second molding jig disposing step of disposing the second molding jig on the first molding jig;
• and
• a molding step of molding the fiber-reinforced plastic by heating the fiber-reinforced plastic material while aligning the pieces by the second molding jig,
• wherein the dimension of the piece corresponding to a place where the shape of the fiber-reinforced plastic member changes in the longitudinal direction is set to be shorter than the pieces corresponding to other places.