A device for fixing a push element, in particular a drawer box to a rail of a pull-out guide, the device comprising a clamping mechanism with a receptacle, into which a web-shaped holding part can be inserted, wherein a self-locking clamping element is provided at the receptacle, by means of which the holding part is secured in a clamping manner against being pulled out. As a result, a particularly stable fixation of the drawer box to a pull-out guide can be achieved.