PURPOSE: To prevent that a recording medium is fanned by arranging the recording medium feed guide positioned on the downstream side in a feed direction so that the guide surface thereof becomes lower than the position where a drive roller and a follower roller becomes a contact state by predetermined quantity and setting the predetermined quantity within the focus depth of laser beam.

CONSTITUTION: Corresponding to the thickness of a film 7, the guide surface 6 of the film feed guide 5 positioned on the downstream side in a feed direction is lower than the top part 1a of a drive roller 1 by a predetermined step (δ2 = about 0.5mm). Since a gradation image is formed, focus depth is about 0.5-1.0 mm but the step δ2 is within the focus depth of laser beam. Since one drive roller 1 and one follower roller 2 are merely provided in this feed apparatus, the apparatus is advantageous from the aspect of cost. Further, since it is suppressed that a film 3 is fanned so as to exceed the focus depth of laser beam during feed, the generation of an image fault such as 'step irregularity', 'the effect of the falling angle of a polygon mirror', 'blurr' or 'fuzz' due to the vibration of an image is prevented to make it possible to form an image of good quality.