Patent ID: 8616683

Claim:
A liquid ejection device comprising: a passage unit in which a plurality of nozzles and a plurality of pressure chambers in communication with the plurality of nozzles are aligned in one direction respectively; and a piezoelectric actuator arranged on the passage unit and applying a pressure to liquid in the plurality of pressure chambers, wherein in the passage unit, a plurality of inspection spaces not in communication with the plurality of nozzles are provided away from the plurality of pressure chambers in a perpendicular direction which is perpendicular to the one direction, the piezoelectric actuator includes: a first layer covering the plurality of pressure chambers and the plurality of inspection spaces; a second layer including at least a piezoelectric layer and being provided on a side of the first layer opposite to a side covering the plurality of pressure chambers and the plurality of inspection spaces, in a manner of overlapping with the plurality of pressure chambers and the plurality of inspection spaces; a plurality of driving electrodes provided at parts overlapping with the plurality of pressure chambers in the second layer; a plurality of inspection electrodes provided at parts overlapping with the plurality of inspection spaces in the second layer; and a plurality of voltage applying pads connected respectively to the plurality of inspection electrodes, and the plurality of inspection electrodes are provided away from the plurality of driving electrodes in the perpendicular direction, and are aligned in the one direction.