Abstract: Sealing arrangement for a rolling bearing exhibiting at least one row of rolling elements 7 between a first ring 1 or 2 and a second ring 2 or 1 which are concentric and radially separated from one another by an annular space 11, at least on one side of the bearing, this arrangement comprising, on the said side of the bearing, an elastic seal 18 fixed to the first ring 1 or 2 and exhibiting a first lip 19 pressing against a bearing surface situated on the second ring inside the said annular space. The said first bearing surface 20 exhibits the overall shape of a cone frustum orientated in such a way that its extension towards the aforementioned side of the bearing approaches the said first ring 1 or 2, and that the said first lip 19 is shaped in such a way that the force with which it presses against the said first bearing surface 20 increases if the pressure inside the rolling bearing increases, for example when lubricating the bearing.