Liquid transport apparatus and method for producing liquid transport apparatus

A liquid transport apparatus which transports a liquid, comprising:

• a channel unit in which a liquid channel including a plurality of pressure chambers arranged along a plane is formed;
• and
• a piezoelectric actuator which applies a pressure to the liquid in each of the pressure chambers, the piezoelectric actuator including:
• a vibration plate which is arranged on a surface of the channel unit to cover the pressure chambers and one surface of which has an insulation property, the one surface not facing the pressure chambers;
• a plurality of individual electrodes which are arranged on the one surface of the vibration plate at areas facing the pressure chambers, respectively, to define inter-electrode areas each of which is defined between two adjacent individual electrodes, among the individual electrodes;
• a plurality of wirings which are arranged on the one surface of the vibration plate, the wirings extending from the respective individual electrodes and passing the inter-electrode areas;
• a piezoelectric layer which is arranged, on a side, of the vibration plate, not facing the pressure chambers, to be overlapped with the individual electrodes and portions of the wirings passing the inter-electrode areas;
• a common electrode which is arranged on one surface, of the piezoelectric layer, not facing the vibration plate to be overlapped with the individual electrodes and the portions of the wirings passing the inter-electrode areas;
• and
• an insulating layer which is arranged between the wirings and the common electrode to be overlapped with the portions of the wirings passing the inter-electrode areas.