Abstract: A photosensor device, which is constituted of a light-applying fiber 107 to apply an inspection light to a subject to be inspected; a light-receiving fiber 108 to receive a reflected light from the subject to be inspected; a laser beam source 114 to emit the inspection light to the light-applying fiber; and a photosensor 113 to receive the reflected light via the light-receiving fiber; which are disposed in a casing 102.

Abstract: At a position opposite to a first board 130(a) supporting a fist light-emitting diode group 131 which has light-emitting portions on the same side and is arranged annularly surrounding a light-delivering hole, a concave mirror 150(a) is located so that the focal point thereof would be formed at the position of the light-delivering hole. Behind the concave mirror 150(a), a second board 140 supporting a second light-emitting diode group 141 is located. Light beams emitted from the first light-emitting diode group 131 are reflected by the concave mirror 150 (a) and collected on an optical connector 181, and light beams emitted from the second light-emitting diode group 141 are allowed to pass through a hole formed at the center of the concave mirror 150(a) and directly collected on an optical connector 181. To the optical connector 181, an optical fiber cable as a light guide is connected to form a light source of illumination for a light guide 100.