PHOTOELECTRIC SENSOR AND LIGHT PROJECTOR

A photoelectric sensor including a light emitter and a light receiver that are separated from each other is provided. The light emitter includes a light emitting unit configured to emit a light beam, and a power supply circuit configured to receive supply of electric power through a first power supply line leading to an outside of the light emitter and to supply required electric power to the light emitting unit. The light receiver includes: a first switching element connected to a second power supply line leading to an outside of the light receiver, the first switching element serving to output a first output signal; a second switching element connected to the second power supply line and serving to output a second output signal; and a detection circuit configured to switch a conducting state of each of the first switching element and the second switching element in accordance with an intensity of light detected. A third power supply line is provided such that one end of the third power supply line is electrically connected to the first power supply line inside the light emitter, and the other end of the third power supply line is electrically connected to the second power supply line outside the light receiver.