The optical switch comprises a platform, and an optical fiber is held in a V groove for securing optical fiber of this platform. A switch element is placed on the platform. The switch element has a frame, and a plurality of alignment pins which are supplied together with the platform are disposed on the bottom face of the frame. A cantilever is secured to the frame, and a mirror is installed at the tip section of the cantilever. A pair of electrodes are secured on the platform. And by supplying voltage between the electrode and cantilever and generating an electrostatic force between them, the mirror is vertically moved.