Patent ID: 7294952

Claim:
A laminated-type piezoelectric element comprising: a plurality of first electrode layers; a plurality of second electrode layers, the first electrode layers and the second electrode layers laminated alternately; a plurality of piezoelectric sheets, each of which is sandwiched between the first electrode layer and the second electrode layer, wherein: each of the first electrode layers defines a plurality of individual electrodes; each of the individual electrodes defined in one of the first electrode layers is electrically connected to counterpart individual electrodes of the others of the first electrode layers; the second electrode layers are electrically connected to each other; each of the individual electrodes has an elongated and substantially rectangle shape extending in a first direction; the individual electrodes defined in each first electrode layer are arranged at predetermined intervals in a second direction perpendicular to the first direction, to form a row; a common electrode defined in each second electrode layer includes a first portion having a band shape, the first portion extending to overlap the row of the individual electrodes when viewed in a plan view; the first portion of the common electrode has a pair of edges extending to be perpendicular to a long side of the rectangle shape of each individual electrode; the individual electrodes and the common electrodes at least partially overlap each other in a laminated direction, when viewed in the plan view; and both ends of each individual electrode in the first direction protrude to outer positions than the pair of edges of the first portion, when viewed in the plan view.