Abstract: A door or wall element comprising castor carriers (21)having castors (12)which are movable on a runner (13) and securing members (28) having securing hooks (31, 32) which are disposed in the runner (13) and prevent the castors (12) from undesirably lifting off from the runner (13). The securing members (28) are mounted rotatably on castor axles (23) of the castors.