We formed optical switches in which a mirror is driven by a magnetostrictive cantilever, and measured their properties. The cantilever has a cross-sectional structure of Al (10 nm)/SmFe (6μm)/Al (10 nm)/Cr (1.2μm)/glass (20μm) and the dimensions are 12 mm ×0.8 mm. A cantilever with a gold mirror on the surface is installed in the gap of a magnetic circuit. The gap field is 1.5 kOe for an electric current of 200 mA. At this current the deflection of a cantilever is 230μm. These components are combined with optical fibers with a lens and a 1 × 2 optical switch is formed. The insertion loss and the crosstalk are 0.23 dB and −64.4 dB, respectively. The power consumption is 120 mW, which is expected to be decreased by improving the magnetostrictve properties. The switching time is 15 ms, which is determined by a vibration of the cantilever. Damping techniques for the vibration can reduce the switching time.