A device for retaining a foot or a boot on a sports apparatus, such as a binding for a snowboard. The device includes a base plate associated with a rear support element/highback. The rear support element is movably mounted with respect to the base plate. A linkage is connected to the base plate and to the rear support element in order to limit the rearward movement thereof. The position of the rear support element with respect to the base plate is longitudinally adjustable.