Patent ID: 7553003

Claim:
A liquid-jet head, comprising: a nozzle plate having nozzle orifices bored therein; a passage-forming substrate provided with recesses including pressure generating chambers communicating with the nozzle orifices; piezoelectric elements provided on a surface of the passage-forming substrate via a vibration plate, each piezoelectric element including a lower electrode, a piezoelectric layer, and an upper electrode; and a joining plate joined to the surface of the passage-forming substrate, where the piezoelectric elements are formed, via an adhesive layer comprising an adhesive agent, wherein a plurality of contact portions and a joining portion are provided in a region where the joining plate is joined to the passage-forming substrate of the passage-forming substrate to the joining plate, the plurality of contact portions are protruded at a predetermined height on the vibration plate, and are substantially contacted by the joining plate, and the joining portion has the adhesive layer of a thickness equal to or larger than the height of the contact portions.