A camera includes a satellite positioning system. The knife edge is irradiated with the laser light, and the sectional image of the laser light is enlarged with an image forming optics, and is picked up by a CCD. The stressed layer has a predetermined compressive intrinsic stress having an absolute value of about 1 GPa or more. An occupant protecting ECU drives occupant protecting means upon receipt of a detected signal from the pressure sensors. A memory device memorizes the effective shift position at a timing when the shift position switching controller stops being energized.