Patent ID: 8104693

Claim:
A multilayer piezoelectric element comprising: a laminated body, wherein the laminated body comprises a plurality of piezoelectric layers laminated with an internal electrode interposed therebetween, a dummy electrode spaced apart and electrically insulated from the internal electrode, an insulating part between the dummy electrode and the internal electrode, wherein the dummy electrode, insulating part, and internal electrode are arranged side by side between the piezoelectric layers adjacent to each other in a laminating direction, and a porous part having more voids than the internal electrode, wherein the porous part is formed at a position opposed in the laminating direction to the insulating part through the piezoelectric layer interposed therebetween, wherein the laminated body has on the side surfaces thereof a pair of external electrodes, and the dummy electrode is electrically connected to an external electrode different from the external electrode, to which the internal electrode existing between the same piezoelectric layers as the dummy electrode, is electrically connected.