Reinforcing member, structural member, and method of manufacturing the same

A manufacturing method comprising:

• providing a prepreg sheet, produced by impregnating a continuous fiber with a resin, on a mold for molding a plate-shaped member, the plate-shaped member including an outer circumferential portion that defines an outer edge of the plate-shaped member having a first surface and a second surface, a convex portion that is convex on the side of the first surface in an area inside the outer circumferential portion, and a plurality of concave portions that are concave on the side of the first surface in an area inside the convex portion;
• and
• heating and pressurizing the prepreg sheet by using the mold to mold a reinforcing member comprising the plate-shaped member made of a fiber-reinforced resin,
• wherein the prepreg sheet is formed by weaving a plurality of first prepreg tapes extending in a first direction and a plurality of second prepreg tapes extending in a second direction that intersects the first direction, and
• wherein each of the plurality of first prepreg tapes and the plurality of second prepreg tapes is formed by impregnating a plurality of continuous fibers extending in one direction with the resin.