Piezoelectric actuator of lamination type

A piezoelectric actuator of a lamination type comprising a sintered lamination body of a plurality of sheet-like electrostrictive elements having opposite lateral edges, electrode layers each provided on at least one of the major surfaces of said each electrostrictive element, each electrode layer having one end extended to one lateral edge of said respective electrostrictive elements and the other end thereof terminated inwardly from the opposite lateral edge of said respective electrostrictive elements to define an insulating zone, insulating gaps each provided between said adjacent electrostrictive elements by said respective insulating zones and disposed alternately adjacent opposite lateral edges of said plurality of electrostrictive elements, each of said insulating gaps being filled with elastic material for absorbing and reducing any internal stress produced in said respective insulating zone, and a pair of external negative and positive electrodes positioned respectively on said opposite lateral edges, and being respectively and commonly connected to the said one ends of said electrode layers exposed on the respective lateral edges of alternate said electrostrictive elements.