Method of manufacturing a multi-nozzle ink jet head

A method of manufacturing a multi-nozzle ink jet head having a plurality of nozzles and a plurality of pressure chambers, comprising the steps of:

• producing piezoelectric type actuators having a diaphragm and a plurality of piezo elements;
• forming, on the piezoelectric type actuators on a side of the diaphragm opposite to the piezo elements, first pressure chamber wall base parts constituting a portion of the piezoelectric type actuator side of dividing walls of the plurality of pressure chambers;
• superimposing, on a side of the first pressure chamber wall base parts opposite from the piezoelectric type actuators, second pressure chamber wall base parts constituting a portion of the dividing walls in such a manner that the first pressure chamber and the second pressure chamber wall base parts constitute the dividing walls;
• and
• forming a nozzle member in which the plurality of nozzles correspond to the plurality of pressure chambers divided by the dividing walls having the first pressure chamber wall base parts and the second pressure chamber wall base parts,
• wherein the first pressure chamber wall base parts each include a high rigidity member having a higher rigidity than the second pressure chamber wall base parts.