A piston pump for a high-pressure cleaning appliance is provided, including a plurality of pump chambers into each of which one piston which is movable back and forth plunges, and which are each in flow connection via a suction valve with a suction inlet and via a pressure valve with a pressure outlet, the pistons each being surrounded by a sealing ring which is supported in the radial direction by a ring wall and in the axial direction by a support ring. In order to develop the piston pump in such a way that it can be manufactured and assembled more cost-effectively, it is proposed that the piston pump includes a one-piece support shield which forms the support rings and surrounds the ring walls in the circumferential direction.