Patent ID: 8773785

Claim:
A piezoelectric actuator comprising: a first piezoelectric element, which is disposed between a circular base member and a moving member, configured to be expandable and contractible in an intersecting direction intersecting a first surface of the base member, the first surface being opposite to the moving member; a plurality of second piezoelectric elements, which are disposed between the first piezoelectric element and the moving member along a circumferential direction of the base member, configured to be expandable and contractible in the circumferential direction; a transfer member, which is disposed between the first piezoelectric element and the moving member and includes a through hole penetrating in the intersecting direction, receiving amounts of expansion and contraction of the first piezoelectric element and the plurality of second piezoelectric elements to transfer a driving force to the moving member; and a support member that penetrates through the through hole and is capable of supporting the moving member.