Patent ID: 8173203

Claim:
A method of manufacturing a piezoelectric actuator, comprising: providing a base member including: a non-interference portion; and a vibration plate including: a joining surface which is joined to one surface of the base member to cover the non-interference portion; and a stacking surface which is located on a side opposite to the joining surface; forming a recess portion in the stacking surface of the vibration plate at a position corresponding to the non-interference portion; filling a filler, which thermally decomposes at a first temperature, in the recess of the vibration plate; forming a stacked body including the vibration plate, the piezoelectric layer, and the filler by forming the piezoelectric layer on the stacking surface of the vibration plate; heating the stacked body to a temperature equal to or higher than the first temperature to thermally decompose the filler and to remove the filler and a portion of the piezoelectric layer located on a surface of the filler; and forming a first electrode arranged on one surface of the piezoelectric layer and a second electrode arranged on the other surface of the piezoelectric layer.