Liquid ejecting head, actuator, liquid ejecting apparatus, and method for manufacturing liquid ejecting head

An actuator, comprising:

• a diaphragm;
• a first electrode;
• a piezoelectric layer;
• and
• a second electrode, wherein
• the diaphragm, the first electrode, the piezoelectric layer, and the second electrode are comprised in this order in a first direction,
• the second electrode includes a first portion that is next to the piezoelectric layer in the first direction and is electrically conductive,
• a length in the first direction is defined as a thickness,
• one position in a second direction intersecting with the first direction is defined as a first position,
• another one position is defined as a second position that is closer to an end of the second electrode in the second direction than the first position is, and
• when above definition is given, the thickness of the first portion at the second position is less than the thickness of the first portion at the first position.

A method for manufacturing a liquid ejecting head that includes a diaphragm, a first electrode, a piezoelectric layer, and a second electrode in this order in a first direction, wherein

• the second electrode includes a first portion that is next to the piezoelectric layer in the first direction and is electrically conductive,
• a plurality of positions in a second direction intersecting with the first direction includes a first position and a second position, the second position being closer to an end of the second electrode than the first position is, and
• the first portion includes a first conductive portion and a second conductive portion,
• the method comprising:
• a layering step of forming the first electrode and the piezoelectric layer in layers in this order over the diaphragm;
• a first conductive portion forming step of forming the first conductive portion that is next to the piezoelectric layer in the first direction;
• and
• a second conductive portion forming step of forming, at the first position, the second conductive portion that is next to the first conductive portion in the first direction, and not forming the second conductive portion at the second position.