To prevent conveyance defects such as jamming by detecting a state of misloading wherein a light shielding leader is still sticking to the front end part of a photosensitive material loaded in a rolled state in a magazine when the magazine is loaded in a processing device for the photosensitive material.

When the photosensitive material 58 is drawn out of the magazine 50 loaded in a device main body and carried on a conveyance path, a light shielding leader detecting means 74 detects whether the light shielding leader is connected to the photosensitive material 58 and when the presence of the light shielding leader is detected, a control part perform operation control for rewinding the light shielding leader into the magazine 50 after stopping carrying the light shielding leader and photosensitive material 58 and then making it possible to take the magazine 50 out of the device main body. Thus, the photosensitive material 58 to which the light shielding leader is connected is prevented from jamming when carried on the conveyance path or a cutter 78 is prevented from being damaged.