A piezoelectric actuator arranged on a substrate, the actuator comprising: a plurality of piezoelectric elements aligned in a first direction on the substrate to form a first piezoelectric element row and a second piezoelectric element row which are arranged side by side in a second direction orthogonal to the first direction, each of the plurality of piezoelectric elements including a piezoelectric portion, a first electrode arranged on one side in a thickness direction of the piezoelectric portion, and a second electrode arranged on the other side in the thickness direction of the piezoelectric portion; an electrode conductive portion electrically connecting the second electrodes with one another; a contact section arranged on the substrate at a position on a side opposite to the second piezoelectric element row in the second direction relative to the first piezoelectric element row; a plurality of drive wires each of which is extended in the second direction from one of the plurality of piezoelectric elements toward the contact section, each of the drive wires being connected to the first electrode of one of the plurality of piezoelectric elements, a part of the drive wires corresponding to the piezoelectric elements of the second piezoelectric element row being each extended toward the contact section while passing between two adjacent piezoelectric elements of the first piezoelectric element row which are adjacent in the first direction; and conductive wires arranged each between two adjacent piezoelectric elements of the second piezoelectric element row which are adjacent in the first direction, each of the conductive wires being conducted with the electrode conductive portion; wherein; the plurality of piezoelectric elements further construct a third piezoelectric element row which is arranged on a side opposite to the first piezoelectric element row in the second direction relative to the second piezoelectric element row; the conductive wires include first conductive wires each of which is arranged between the two adjacent piezoelectric elements, of the second piezoelectric element row, adjacent in the first direction, and second conductive wires each of which is arranged between two adjacent piezoelectric elements, of the third piezoelectric element row, adjacent in the first direction; and characterized in that electric resistance in the second conductive wires is lower than electric resistance in the first conductive wires. a plurality of piezoelectric elements aligned in a first direction on the substrate to form a first piezoelectric element row and a second piezoelectric element row which are arranged side by side in a second direction orthogonal to the first direction, each of the plurality of piezoelectric elements including a piezoelectric portion, a first electrode arranged on one side in a thickness direction of the piezoelectric portion, and a second electrode arranged on the other side in the thickness direction of the piezoelectric portion; an electrode conductive portion electrically connecting the second electrodes with one another; a contact section arranged on the substrate at a position on a side opposite to the second piezoelectric element row in the second direction relative to the first piezoelectric element row; a plurality of drive wires each of which is extended in the second direction from one of the plurality of piezoelectric elements toward the contact section, each of the drive wires being connected to the first electrode of one of the plurality of piezoelectric elements, a part of the drive wires corresponding to the piezoelectric elements of the second piezoelectric element row being each extended toward the contact section while passing between two adjacent piezoelectric elements of the first piezoelectric element row which are adjacent in the first direction; and conductive wires arranged each between two adjacent piezoelectric elements of the second piezoelectric element row which are adjacent in the first direction, each of the conductive wires being conducted with the electrode conductive portion; wherein; the plurality of piezoelectric elements further construct a third piezoelectric element row which is arranged on a side opposite to the first piezoelectric element row in the second direction relative to the second piezoelectric element row; the conductive wires include first conductive wires each of which is arranged between the two adjacent piezoelectric elements, of the second piezoelectric element row, adjacent in the first direction, and second conductive wires each of which is arranged between two adjacent piezoelectric elements, of the third piezoelectric element row, adjacent in the first direction; and characterized in that electric resistance in the second conductive wires is lower than electric resistance in the first conductive wires.