a piezoelectric actuator with piezoelectric elements , fastened between an actuator head and an actuator foot , and with a plastic sleeve surrounding at least the piezoelectric elements is proposed , which is set in a clamping ring on the actuator head and / or the actuator foot of the piezoelectric actuator . the respective clamping ring may be a metal part or a plastic part , which is equipped with clamping lugs suitable for setting the plastic sleeve and is thrust , pressed , or shrunk onto the respective actuator head and / or actuator foot of the steel piezoelectric actuator .