Patent ID: 7210770

Claim:
An actuator device, comprising: a substrate, formed with a pressure generating chamber; a first piezoelectric element, disposed so as to face pressure generating chamber, the first piezoelectric element comprising: a first electrode; a first piezoelectric layer, laminated on the first electrode; a second electrode, disposed on the first piezoelectric layer; a second piezoelectric layer, laminated on the first piezoelectric layer while covering the second electrode; and a third electrode, disposed on the second piezoelectric layer and electrically connected to the first electrode; and a second piezoelectric element, arranged adjacent to the first piezoelectric element, the second piezoelectric element comprising: a fourth electrode, electrically connected to the first electrode and the third electrode; a third piezoelectric layer, laminated on the fourth electrode; and a fifth electrode, disposed on the third piezoelectric layer; and a fourth piezoelectric layer, laminated on the third piezoelectric layer while covering the fifth electrode, wherein no additional electrode is formed on the fourth piezoelectric layer.