An actuator includes: a base member; a first slider that is placed slidably in a first axial direction with respect to the base member; a second slider that is placed slidably in a second axial direction with respect to the base member, the second axial direction being perpendicular to the first axial direction; a moving piece that is placed at a crossing point between the first slider and the second slider, and is capable of moving in a plane, the moving piece being slidably engaged with the first slider and the second slider; a magnet that is fixed to one end of the first slider, and a magnet that is fixed to one end of the second slider; and coils that are designed to allow the magnets to move inner spaces thereof.