The invention provides a recording medium supplying unit which prevents a photosensitive material from crookedly moving in a conveying unit and being blocked between the conveying unit and a conveyingguide component and can smoothly conveys the photosensitive material to a main body part of a picture processing device. The recording medium supplying unit 11 as connection between a selection partand the picture processing device 1 comprises: a first adjusting part 84 used to adjust a tilt angle of conveying unit 83 with respect to a conveying surface of the photosensitive material P; and a second adjusting part 96 used to adjust corresponding positions of the conveying guide component 90 and the conveying unit 83.