A composite cured product body is provided, which includes a first cured product part formed from a condensation reaction curable silicone rubber, and a second cured product part adhering to a surface of said first cured part formed from an addition reaction curable organopolysiloxane composition. Both of the first antenna and the second antenna are disposed in or on the body. An inner body is slidably received within the outer body. By using two mirrors, the light from the object is led to the photodetector 3 without being shaded.