Liquid ejecting head, liquid ejecting apparatus, and actuator device

A liquid ejecting head comprising:

• a flow passage substrate that has a pressure generation chamber, the pressure generation chamber formed in the flow passage substrate being in communication with a nozzle opening through which liquid is ejected;
• a piezoelectric element that includes a first electrode, a piezoelectric substance layer, and a second electrode, the piezoelectric element being provided over one surface of the flow passage substrate, the piezoelectric element getting deformed to form a convex toward the pressure generation chamber when the piezoelectric element is driven;
• and
• a protection film that covers the piezoelectric element, the protection film having an opening through which an upper surface of the second electrode is exposed, the protection film being made of an inorganic insulating material,
• wherein an end of the opening formed in the protection film viewed in a direction of the length of the pressure generation chamber is located at a position relatively close to the center in comparison with an area at which the center of curvature of a curve of the piezoelectric element that forms near a wall around the pressure generation chamber during deformation operation lies at a pressure-generation-chamber side.