A composite material molding method for molding a composite material by heating and curing a laminated body of the prepreg sheets (S1, S2, S3) laminated on a composite material molding jig, wherein the composite material molding jig comprises: a rigid portion having a surface for laminating the prepreg sheets; and a convex portion for forming a groove for inserting an optical fiber sensor, the convex portion being formed in a surface side of the rigid portion, wherein the convex portion has a length of not less than 1 m and not more than 10 m in a longitudinal direction of the convex portion, the composite material molding method further comprising: producing the laminated body of the prepreg sheets, which has the groove; and molding the composite material by curing the laminated body of the prepreg sheets, the composite material having the groove, wherein the groove is formed without cutting processing or press processing of the composite material after curing, wherein the groove is formed by disposing one ply of a prepreg sheet or plies of prepreg sheets in each of both sides of the convex portion for forming the groove, a length direction of fibers of the one ply of the prepreg sheet or the plies of the prepreg sheets being directed to a length direction of the convex portion, the convex portion having been formed on a surface of the composite material molding jig, the composite material molding method further comprising: inserting an optical fiber sensor into the groove formed on the composite material and applying an adhesive between the groove and the optical fiber sensor; and producing a composite material, integrated with the optical fiber sensor, by hardening the adhesive. a rigid portion having a surface for laminating the prepreg sheets; and a convex portion for forming a groove for inserting an optical fiber sensor, the convex portion being formed in a surface side of the rigid portion, wherein the convex portion has a length of not less than 1 m and not more than 10 m in a longitudinal direction of the convex portion, the composite material molding method further comprising: producing the laminated body of the prepreg sheets, which has the groove; and molding the composite material by curing the laminated body of the prepreg sheets, the composite material having the groove, producing the laminated body of the prepreg sheets, which has the groove; and molding the composite material by curing the laminated body of the prepreg sheets, the composite material having the groove, wherein the groove is formed without cutting processing or press processing of the composite material after curing, wherein the groove is formed by disposing one ply of a prepreg sheet or plies of prepreg sheets in each of both sides of the convex portion for forming the groove, a length direction of fibers of the one ply of the prepreg sheet or the plies of the prepreg sheets being directed to a length direction of the convex portion, the convex portion having been formed on a surface of the composite material molding jig, the composite material molding method further comprising: inserting an optical fiber sensor into the groove formed on the composite material and applying an adhesive between the groove and the optical fiber sensor; and producing a composite material, integrated with the optical fiber sensor, by hardening the adhesive. inserting an optical fiber sensor into the groove formed on the composite material and applying an adhesive between the groove and the optical fiber sensor; and producing a composite material, integrated with the optical fiber sensor, by hardening the adhesive.