Toner material is transferred from a locally charged imaging member to a printed material with a d. By injection molding, the common flange, the joining portions and a portion of the main bodies are formed in one piece as a first component, and the remaining portion of the main bodies is formed in one piece as a second component. The engaging unit holds the disc tray and the tray cover engaged with each other when the disc tray is received in the cabinet to thereby prevent the tray cover from being opened.