A mount substrate (third substrate) (300) is disposed so as to face a mirror substrate (second substrate) (200) having a larger projection area, and the mirror substrate (200) is bonded to the mount substrate (300) in a region in which an actuator substrate (100) and the mirror substrate (200) do not overlap each other in an in-plane direction (XY direction) parallel to an in-plane direction of a reflective member (202).