Abstract: A torsional rocker used in an optical scanner comprises a movable element, a pair of torsion spring structures or elastic members for rockably supporting the movable element, and a stationary element which fixes or holds the torsion spring structures. The movable element includes a coil which surrounds its edges and a mirror inside the coil. The opposite ends of the coil are connected individually to electrode pads on the stationary element by means of wires. The torsion spring structure includes a pair of leaf springs which extend parallel to each other, and the torsion spring structure also includes another pair of leaf springs which extend parallel to each other. The four leaf springs have the same thickness.