A printing apparatus (1) has an ink-jet printer (2), a medium tray (4) for conveying a medium (3) to be printed by the printer (2), a medium feeding mechanism (5), and a medium retrieving mechanism (6). The printer (2) has an ink-jet printing head (21) and a tray conveyance mechanism for reciprocating the medium tray (4) along a predetermined conveyance path traversing the printing position of the printing head (21). A medium tray (4) carrying an unprinted medium (3) is placed on the medium feeding side of the printer (2), the medium tray (4) is conveyed past the printing position of the printing head (21), and the medium thereon is printed. The medium tray (4) is discharged to a medium tray discharge section (24). After removal of the medium (3), the medium tray (4) is returned to its original position. The medium tray (4) carrying the media (3) is reciprocated for repeated printing of the media (3). Printing of captions and the like on the surfaces of CD-Rs and other plate-like recording media can be readily conducted.