PURPOSE: To prevent a sensitive material from being exposed to light by the light to be emitted by a discrimination sensor reading information of a discrimination seal stuck to the sensitive material box by simple constitution.

CONSTITUTION: A sensitive material 6 wound up around a feed reel 3 is held into a sensitive material box 2 and the sensitive material 6 is pulled out of the sensitive material box 2 through a pulling-out port 17 of the sensitive material 6 provided in a fixed surface of the sensitive material box 2. Then a discrimination seal 16 of the sensitive material 6 is stuck to the surface D which is different from the surface of the sensitive material box 2 where the pulling-out port 17 of the sensitive material 6 is provided.