Abstract: An apparatus for candling eggs includes a transmission system of a luminous flux directed towards the egg to be examined and located in its incubation rack a reception device of the luminous flux transmitted after passing through the mass of the egg, and an automatic analyzer of the recorded signals. The transmission system and the reception device are arranged in a vertical plane or a substantially vertical plane, one beneath the eggs to be examined and the other above the latter. A screen protects the transmission system against smears originating from the eggs in the incubation racks.