Abstract: The invention relates to an elongate retaining element for building sheets, having, as seen in cross section perpendicular to its direction of elongation, a heard part (1) for engaging at least one said building sheets, a base part (3) for mounting the elongate retaining element on a support structure, and a connecting flange (2) extending upwardly from said base part (3) and joining said head part (1) to said base part (3). The elongate retaining element is made from a plastic material, such as PA, and has a reinforcement sheet (4), such as a metal sheet, extending from the connecting flange (2) into at least the head part (1). As seen in cross section, in the head part one free end (5) of the reinforcement sheet is bent into a section with an acute angle of less than 90°.