PURPOSE: To provide a photographic film cartridge and a camera using it, with which the sensitivity information of a film can be sensed by a reading device to be constructed at a low cost.

CONSTITUTION: A photographic film cartridge is composed of a body 3, a spool 4 to be accommodated therein rotatably, and a film 5 wound on this spool, 4. A barcode plate 6 is attached to one end of the spool 4, and on the side wall of the body 3, a mark 9 is provided for those whose film 5 sensitivity is below ISO 400, while no such a mark is provided for ISO 400 or more. On the inner wall of the cartridge chamber 12 of camera, a photo-sensor 14 is mounted in the position mating with the mark 9.