A sealing unit for a wheel bearing, including a cover cap of sheet metal on a rotationally fixed bearing ring. An elastic seal on the cover cap. A baffle plate which protrudes in a radial direction, displaced on a bearing ring which can rotate with respect to the rotationally fixed bearing ring. The cover cap has a rotationally symmetrical hollow shoulder which extends axially in the direction of roller bodies of the bearing. The seal is fixed with respect to the shoulder of the cover cap and at the same time the seal bears with at least one sealing lip, at least once in a radially sealing fashion against a hollow cylindrical section which is fixed with respect to the rotatable bearing ring and protrudes axially from the baffle plate in the direction of the bearing roller bodies.