A guide rail of a guide system for a push-in element is proposed, wherein the guide rail comprises a rail body and a fastening element, wherein the fastening element is configured in such a way as to fasten the guide rail on a mating portion in the state of use of the guide system, wherein the fastening element is mounted on the rail body and cohesively bonded thereto, and wherein the fastening element has a flat material portion with opposite main sides and with a narrow front edge portion between the main sides. According to the invention, in the state with the fastening element connected to the rail body, the edge portion of the fastening element abuts a surface side on the rail body, which surface side is oriented upright in the state of use of the guide rail.
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