A piezoelectric actuator having a first surface and a second surface that faces away from the first surface and having a plurality of piezoelectric elements at a plurality of positions along the first surface, the piezoelectric actuator comprising: a piezoelectric layer that extends along the first surface; a common electrode that is provided on the piezoelectric layer at a side adjacent to the first surface and that extends over the plurality of piezoelectric elements; a plurality of first individual electrodes (39, 51) that are provided on the piezoelectric layer at a side adjacent to the second surface, that are positioned individually at the plurality of piezoelectric elements, and that are not electrically connected to each other; a first insulating layer that is provided on the common electrode at the side adjacent to the first surface and that extends over the plurality of piezoelectric elements; a plurality of second individual electrodes (31, 45) that are provided on the first insulating layer at the side adjacent to the first surface, that are positioned individually at the plurality of piezoelectric elements, that individually overlap centers of the plurality of first individual electrodes (39, 51) in a see-through plan view, and that are electrically connected to each other; a plurality of first wiring lines that are provided on the piezoelectric layer at the side adjacent to the second surface and that are individually connected to the plurality of first individual electrodes (39, 51); and a plurality of second wiring lines that are provided on the first insulating layer at the side adjacent to the first surface and that connect the plurality of second individual electrodes (31, 45) to each other, wherein a direction in which the plurality of first wiring lines individually extend from the plurality of first individual electrodes (39, 51) crosses a direction in which the plurality of second wiring lines individually extend from the plurality of second individual electrodes (31, 45), wherein the piezoelectric actuator further comprises: a second insulating layer that is provided on the piezoelectric layer and that extends over the plurality of first individual electrodes (39, 51); and a plurality of third individual electrodes (43, 55) that are provided on the second insulating layer at the side adjacent to the second surface, that are positioned individually at the plurality of piezoelectric elements, and that are electrically connected to each other, wherein a total area of the plurality of second individual electrodes (31, 45) and the plurality of second wiring lines is greater than a total area of the plurality of first individual electrodes (39, 51) and the plurality of first wiring lines. a piezoelectric layer that extends along the first surface; a common electrode that is provided on the piezoelectric layer at a side adjacent to the first surface and that extends over the plurality of piezoelectric elements; a plurality of first individual electrodes (39, 51) that are provided on the piezoelectric layer at a side adjacent to the second surface, that are positioned individually at the plurality of piezoelectric elements, and that are not electrically connected to each other; a first insulating layer that is provided on the common electrode at the side adjacent to the first surface and that extends over the plurality of piezoelectric elements; a plurality of second individual electrodes (31, 45) that are provided on the first insulating layer at the side adjacent to the first surface, that are positioned individually at the plurality of piezoelectric elements, that individually overlap centers of the plurality of first individual electrodes (39, 51) in a see-through plan view, and that are electrically connected to each other; a plurality of first wiring lines that are provided on the piezoelectric layer at the side adjacent to the second surface and that are individually connected to the plurality of first individual electrodes (39, 51); and a plurality of second wiring lines that are provided on the first insulating layer at the side adjacent to the first surface and that connect the plurality of second individual electrodes (31, 45) to each other, wherein a direction in which the plurality of first wiring lines individually extend from the plurality of first individual electrodes (39, 51) crosses a direction in which the plurality of second wiring lines individually extend from the plurality of second individual electrodes (31, 45), wherein the piezoelectric actuator further comprises: a second insulating layer that is provided on the piezoelectric layer and that extends over the plurality of first individual electrodes (39, 51); and a plurality of third individual electrodes (43, 55) that are provided on the second insulating layer at the side adjacent to the second surface, that are positioned individually at the plurality of piezoelectric elements, and that are electrically connected to each other, wherein a total area of the plurality of second individual electrodes (31, 45) and the plurality of second wiring lines is greater than a total area of the plurality of first individual electrodes (39, 51) and the plurality of first wiring lines.