Patent ID: 7980680

Claim:
A piezoelectric actuator comprising: a piezoelectric material layer which is formed of a piezoelectric ceramics material and which has a predetermined drive area; a first electrode and a second electrode which are arranged on one surface and the other surface respectively of the piezoelectric material layer each at a portion corresponding to the drive area; and a ceramics layer which is formed of a ceramics material and which is stacked to face the surface of the piezoelectric material layer on which the first electrode is arranged, wherein elastic layers having a coefficient of elasticity lower than that of the piezoelectric material layer are formed on both surfaces respectively of a stacked body which includes the piezoelectric material layer and a surface of the ceramics layer opposite the surface facing the piezoelectric material layer, and wherein the elastic layers are resin layers each formed of a resin material, and a thickness of each of the resin layers is about 1 to 10 μm.