A piezoelectric actuator includes: a plurality of first piezoelectric elements; a first member that is interposed between opposing faces of the plurality of the first piezoelectric elements and that is driven in a first direction by the plurality of the first piezoelectric elements; a second piezoelectric element that is disposed in the first member; a second member that is disposed in contact with the second piezoelectric element and that is driven in a second direction intersecting the first direction by the second piezoelectric element; and a third member that comes in contact with the second member and that is moved relative to the first member by driving the second member.