Patent ID: 7273268

Claim:
A piezoelectric device including: a piezoelectric body layer; a first electrode layer disposed at a side of one face of the piezoelectric body layer, at which first electrode layer a higher potential is to be applied; and a second electrode layer disposed at a side of a face of the piezoelectric body layer that is opposite to the side thereof at which the first electrode layer is disposed, at which second electrode layer a lower potential is to be applied, the piezoelectric device comprising: a metallic layer disposed in contact with the face of the piezoelectric body layer at the side thereof at which the first electrode layer is disposed, the metallic layer being formed of a metallic material with a standard electrode potential greater than 0 V; and a metal oxide layer disposed in contact with the face of the piezoelectric body layer at the side thereof at which the second electrode layer is disposed, the metal oxide layer being formed of a metal oxide.