A biological information detecting device includes a sensor detecting biological information of a subject, and a case housing the sensor, the case includes a light transmitting section formed of a resin material, the light transmitting section including a detection window through which light incident on the sensor is transmitted, and a light shielding section formed of a glass-containing resin material, the light shielding section disposed in the vicinity of the light transmitting section, wherein the light transmitting section and the light shielding section are integrally formed.
