A cassette for mounting on an image forming apparatus body and supplying media to the apparatus body. The cassette includes a first tray, a second tray and a slide mechanism. The first tray and second tray are each able to contain multiple media. The slide mechanism allows the trays to be movable relative to each other. The first tray has an oblique surface and a first separation portion, and the second tray has an oblique surface and a second separation portion. Each of the oblique surfaces can separate an uppermost medium from other media such that distal ends of the media during delivery abut against the oblique surface. Each of the first and second separation portions guides the separated medium along the oblique surface in a paper feeding direction. The first separation portion has a different structure than the second separation portion provided for the second tray.