To make a device have a function covering and hiding a discharged recording material and make the device multifunctional by providing the device with a function to be mounted on a supply cassette and a function to be installed in the upper part of a discharge tray for covering and hiding a recording material on the discharge tray and providing a cover to be selected and mounted.

A handle 6b attached to a cover 6 of a supply cassette 1 is grasped, the cover 6 is pulled out and the cover 6 is removed from the supply cassette 1. The cover 6 is inserted into an insertion port 17 of a printer main body 16 and is set as a discharge cover of a discharge tray 15. As a result, a recording material P forming an image is discharged by a discharge roller 14 and is loaded on the discharge tray 15. At this time, printed matter is caught by the eyes of others because the printed matter is covered and hidden by the cover 6 of the supply cassette 1. To take out the recording material P from this discharge tray 15, the handle 6b is grasped and an opening and closing cover 6c is opened to the upper part. Thus, economical burden is reduced, saving space is made possible and operability can be improved.