Patent ID: 7798618

Claim:
An ink jet head, comprising: a passage unit comprising a nozzle and a pressure chamber communicating with the nozzle; and an actuator unit comprising a piezoelectric layer, a first electrode connected with a front surface of the piezoelectric layer, a second electrode connected with a back surface of the piezoelectric layer, a first insulating layer located between the second electrode and the passage unit, and a first conductive member, the first insulating layer comprising a first through hole, at least a part of the first conductive member located in the first through hole; wherein the passage unit comprises a concave portion located at a position facing the first through hole, and a protruding portion which protrudes from an inner surface of the concave portion, one end of the first conductive member is electrically connected with the second electrode, and the other end of the first conductive member makes contact with the protruding portion.