The piezoelectric actuator

It piezoelectric actuators are already known with ceramic layers and electrode layers, wherein the front ends of the piezoelectric actuator in each case an outer cover layer is arranged, and wherein the ceramic layers and the outer cover layers each having a predetermined dielectric constant. Due to the rapid Wiring of the actuator considerable electromagnetic interference that must be reduced by expensive measures on the control unit or electrical lines are formed. In the inventive device, the electromagnetic interference is reduced by the parasitic capacitance between the actuator and the end connected to electrical ground actuator housing is reduced. According to the invention it is proposed that the outer cover layers (16, 17) have a lower relative dielectric constant than the ceramic layers (2) between the outer cover layers (16, 17).