The method of manufacturing a liquid ejection head comprises the steps of: forming a plurality of piezoelectric elements on a diaphragm; stacking an intermediate plate which includes recess sections for covering the piezoelectric elements and drive wires connected to the piezoelectric elements, on a surface of the diaphragm on which the piezoelectric elements are formed, in such a manner that
peripheral spaces are formed around the piezoelectric elements by means of the recess sections and electrical connections are created between the drive wires and the piezoelectric elements; connecting an
integrated circuit to end sections of the drive wires which are opposite to connection sections between the drive wires and the piezoelectric elements; forming an
actuator function unit by electrically and mechanically bonding the diaphragm, the piezoelectric elements, the drive wires, the intermediate plate and the
integrated circuit after the formation of the piezoelectric elements on the diaphragm, the stack of the intermediate plate on the diaphragm, and the connection of the
integrated circuit and the drive wires, in such a manner that the piezoelectric elements are electrically driven via the integrated circuit; measuring displacement of the diaphragm by operating the integrated circuit in the
actuator function unit; and bonding a flow path forming member to the
actuator function unit after the measurement of the displacement of the diaphragm, the flow path forming member being provided for forming a plurality of pressure chambers connected to a plurality of nozzles and forming a common liquid chamber for storing liquid supplied to the pressure chambers.