Patent ID: 7794064

Claim:
A liquid-jet head comprising: pressure generating chambers communicating with nozzle orifices ejecting a liquid; piezoelectric elements which are provided in a region facing the pressure generating chambers and each of which includes a lower electrode, a piezoelectric layer and an upper electrode; and a lead electrode for the lower electrode, which is drawn out from the lower electrode; wherein: when the region facing a plurality of arranged pressure generating chambers and a region facing the compartment walls of the plurality of arranged pressure generating chambers are called a first region and a direction perpendicular to an arrangement direction of the plurality of pressure generating chambers is called a first direction; the lower electrode is a common electrode provided at least in the first region and has a common lead portion which is drawn out to outside of the first region from at least one side, in the first direction of the lower electrode; the lead electrode for the lower electrode is electrically connected to the common lead portion of the lower electrode; and a connection portion of the lead electrode for the lower electrode and the common lead portion is positioned in a region outside of the region, wherein a common electrode pattern connected to the lower electrode is provided along the arrangement direction of the pressure generating chambers in a region outside an end opposite to the lead electrode for the lower electrode in the region facing the plurality of arranged pressure generating chambers.