Patent ID: 7267432

Claim:
An ink-jet head comprising: a flow passage unit in which a plurality of pressure chambers that communicate with respective nozzles are arranged parallel with a plane in matrix form; and an actuator unit that is fixed to one surface of the flow passage unit, for varying capacities of the respective pressure chambers, the actuator unit including; a plurality of individual electrodes having a plurality of main electrode regions that are provided inside respective pressure chamber areas that the respective pressure chambers are taken over on the plane; and connection electrode regions that are connected continuous to the respective main electrode regions and signal lines; a common electrode that covers an area where the pressure chambers are formed; and at least one piezoelectric sheet that covers the pressure chambers and is interposed between the common electrodes and the individual electrodes, wherein each individual electrode is provided with an auxiliary electrode portion that is led out of the individual electrode toward another individual electrode adjacent to the individual electrode, and wherein the auxiliary electrode portion has a proximate portion that is located close to the adjacent individual electrode inside a pressure chamber area corresponding to the adjacent individual electrode.