Abstract: The invention relates to a jack, the jack comprises a base for placing on the ground and an elevator mechanism which bears against the base via a leg (1) linked to the base by a device so that the leg can pivot on the base about a horizontal axis X′X and can slide on the base along the axis, the jack being characterized in that the base (5) has a longitudinal rig (5b) with a rounded top projecting above the base, the rib defining the axis, the leg (1) is provided at its bottom end with a slide (8) made of a block of synthetic organic material engaged in the bottom end and held to the leg by a device, the slide being shaped so as to be capable of fitting astride the rib of the base with the ability to pivot on the rib about the axis and to slide along the rib, and a link device (9, 10, 12) is established between the leg and the base to hold the slide on the rib. The invention applies in particular to a jack for lifting a vehicle.