PURPOSE: To perform the reliable feed of sheet substances one by one and to facilitate a sheet substance leafing work and to increase the efficiency of the work.

CONSTITUTION: A suction board 20 is raised at a first movement speed being a comparatively low speed under operation of a rotational drive source 40 while a plurality of photograph photosensitive material 14 is held at the suction board 20. After it is detected by a sheet substance detecting mechanizes 18 that only the single photograph photosensitive material 14 is held at the suction board 20, the rotational drive source 40 is driven and controlled by means of a controller 58 and the suction board 20 is raised at a comparative high speed second moving speed. Therefore, a leafing work for the photograph photosensitive material 14 is reliably and efficiently executed.