MULTI-OPTICAL AXIS PHOTOELECTRIC SENSOR

A casing 100 forms an outer shape of each of a projector and an optical receiver of a multi-optical axis photoelectric sensor. The casing 100 includes a frame body 3 having a front and both ends open, a pair of caps 4 and 4 to cover both ends of the frame body 3, and a light transmissive plate 6 to cover the open front of the frame body 3. In the inner surfaces of both side plates of the frame body 3, supports 31 and 31 which extend along the corresponding side edges of the opening of the front are formed. Both side edges of the light transmissive plate 6 are supported by the supports 31 and 31, and both ends thereof are supported by the caps 4 and 4. Portions of the caps 4 and 4 that support the light transmissive plate 6 include communication portions to communicate with the supports 31 and 31 of the frame body 3, and a string-shaped elastic member 7 is disposed around a closed loop formed by each support and each communication portion. The light transmissive plate 6 is held between the string-shaped elastic member 7 and at least one fixing member disposed for the frame body 3 and the caps 4 and 4. This configuration facilitates fixing of the light transmissive plate 6 and changing of a size of the frame body 3.