A piezoelectric actuator comprising: a piezoelectric layer; and a conductor layer that is provided directly or indirectly on the piezoelectric layer, wherein, in a plan view, the conductor layer includes a plurality of individual electrodes that are arranged with intervals therebetween, and a plurality of wiring lines that extend from the plurality of individual electrodes, and wherein each wiring line of the plurality of wiring lines includes a wide portion including a part positioned at a center of the each wiring line in a length direction, and a first narrow portion disposed between the wide portion and one individual electrode of the plurality of individual electrodes to which the each wiring line is connected, the first narrow portion having a width less than a width of the wide portion, characterized in that each wiring line extends from the one individual electrode to an adjacent individual electrode of the plurality of individual electrodes, and and in that each wiring line includes the first narrow portion disposed between the wide portion and the one individual electrode, and a second narrow portion disposed between the wide portion and the adjacent individual electrode, the second narrow portion having a width less than the width of the wide portion. a piezoelectric layer; and a conductor layer that is provided directly or indirectly on the piezoelectric layer, wherein, in a plan view, the conductor layer includes a plurality of individual electrodes that are arranged with intervals therebetween, and a plurality of wiring lines that extend from the plurality of individual electrodes, and a plurality of individual electrodes that are arranged with intervals therebetween, and a plurality of wiring lines that extend from the plurality of individual electrodes, and wherein each wiring line of the plurality of wiring lines includes a wide portion including a part positioned at a center of the each wiring line in a length direction, and a first narrow portion disposed between the wide portion and one individual electrode of the plurality of individual electrodes to which the each wiring line is connected, the first narrow portion having a width less than a width of the wide portion, a wide portion including a part positioned at a center of the each wiring line in a length direction, and a first narrow portion disposed between the wide portion and one individual electrode of the plurality of individual electrodes to which the each wiring line is connected, the first narrow portion having a width less than a width of the wide portion, characterized in that each wiring line extends from the one individual electrode to an adjacent individual electrode of the plurality of individual electrodes, and and in that each wiring line includes the first narrow portion disposed between the wide portion and the one individual electrode, and a second narrow portion disposed between the wide portion and the adjacent individual electrode, the second narrow portion having a width less than the width of the wide portion. the first narrow portion disposed between the wide portion and the one individual electrode, and a second narrow portion disposed between the wide portion and the adjacent individual electrode, the second narrow portion having a width less than the width of the wide portion.