Method of manufacturing liquid ejection head

A method of manufacturing a liquid ejection head in which piezoelectric bodies are formed on a diaphragm which constitutes walls of a plurality of pressure chambers, the method comprising:

• a filling step of filling piezoelectric material into a plurality of recess sections of a molding substrate formed with the plurality of recess sections so as to correspond to the pressure chambers;
• a lamination step of arranging a first green sheet that is to form the diaphragm onto the molding substrate in such a manner that the first green sheet covers the recess sections filled with the piezoelectric material;
• a step of forming piezoelectric bodies on an opposite side of the diaphragm from the plurality of pressure chambers;
• a first heating step of heating the piezoelectric material filled in the recess sections in such a manner that the piezoelectric material contracts to form voids in the recess sections, after the lamination step is performed;
• and
• a separation step of separating the piezoelectric material from the molding substrate after the first heating step is performed.