Liquid ejecting head, liquid ejecting apparatus, piezoelectric element, and ultrasonic sensor

A liquid ejecting head comprising:

• a piezoelectric element including a first electrode, a piezoelectric layer which is provided on the first electrode and on which a plurality of piezoelectric films are laminated, a second electrode which is provided on the piezoelectric layer, and a plurality of active units which are interposed between the first electrode and the second electrode, wherein the second electrode is common to multiple piezoelectric elements;
• and
• a pressure generating chamber which communicates with nozzle openings which eject liquid, and in which a pressure fluctuation is generated by the piezoelectric element,
• wherein a plurality of grooves with inner faces facing the first electrode side are formed on a side surface of the piezoelectric layer on each interface of each of the piezoelectric films along a direction which crosses a direction which goes from the first electrode to the second electrode,
• wherein the second electrode is formed on the side surface of the piezoelectric layer,
• wherein the second electrode is deposited to continuously cover an inside surface of the plurality of grooves, and
• wherein each of the plurality of grooves has a similar shape and orientation.