Patent ID: 8727497

Claim:
A piezoelectric actuator which is joined to a base member, comprising: a piezoelectric layer which is arranged on one surface of the base member; a plurality of driving electrodes which are arranged on one surface of the piezoelectric layer; a plurality of leading electrodes which are led from the driving electrodes to apply a voltage to the driving electrodes, respectively; and a low dielectric layer which is arranged between the piezoelectric layer and the leading electrodes and which has a dielectric constant lower than that of the piezoelectric layer, wherein the leading electrodes extend to outside of driving areas of the piezoelectric layer, which overlap with the driving electrodes, and a first leading electrode of the plurality of leading electrodes is led in a first direction, and a second leading electrode of the plurality of leading electrodes is led in a second direction different from the first direction, wherein the driving electrodes and the leading electrodes are formed of a conductive material comprising metal particles contained in an insulating material, and wherein the leading electrodes are formed of the conductive material in which a blending ratio of the metal particles with respect to the conductive material is smaller than that of the driving electrodes.