This invention relates to a thin and compact galvanomirror produced by using semiconductor fabrication technology. A flat movable plate (5) and a torsion bar (6) for rotatably supporting this movable plate (5) are integrally formed on a silicon substrate (2) by using semiconductor fabrication technology, and a flat coil (7) and a total reflection mirror (8) are formed on the upper surface of the movable plate (5). Further, glass substrates (3), (4) are disposed on the upper and lower surfaces of the silicon substrate (2), and permanent magnets (10A, 10B and 11A, 11B) for causing magnetic fields to act on the coil (7) are fixed at predetermined positions of these glass substrates. The rocking angle of the movable plate (5) is varied depending on the balance of the resulting magnetic force and the torque by controlling the quantity and direction of the current flowing through the coil (7).