A continuous, rotary empty can photoinspecting apparatus which has a continuously rotating star wheel including a plurality of can seats formed at equal intervals on the outer periphery, and an optically sealed annular disc confronting a telescopic slide pusher so as to be integrally rotatable with the star wheel therebetween. As the can seats are moved through an empty can supply station, unpainted and unprinted bright empty cans are introduced one by one and immediately after trimming and suction-held by their bottom ends onto the nozzle port at the end of the slide pusher. The empty can is subsequently moved to a photoinspecting station and inserted at its open end into the groove of the annular disc by the forward pushing of the slide pusher. The annular disc is constructed with a non-glossy black surface for attenuating externally introduced light reflecting on the surface, a trap groove in the depth, and a conical guide to facilitate the introduction of the open end of the can at the inlet. This apparatus can thus photoinspect the existence of transmitted light in the interior of an empty can, and sort and exhaust good and bad empty cans in a fully automatic and mechanized operation.