A guiding frame, with a carrier (10) provided with a fastening groove (11) and carrying at least one guiding rail (12) disposed parallel to said carrier and secured in a fastening groove (11), and on which rests a guiding bearing (13) that guides a sliding part (22).The guiding frame is implemented so that the substantially rectangular guiding rail (12) is supported via a rounded portion on the supporting edges that delimit the fastening groove (11) or on an intermediate bearing that bridges the fastening groove (11).
