To provide a tray which can be conveyed with high precision without fear about the tray being caught by a roller even in case an adapter is not used.

An optical disc D1 with 12 cm outside dia. and an optical disc D2 with 8 cm outside dia. are insetted in a setting part (a recessed part) 52 formed in a plate-shaped tray main body 51, and are conveyed by passing through a nip between a conveyance drive roller to drive/rotate and a conveyance driven roller 31 (31B and 31C) to be driven to rotate in close contact with the conveyance drive roller. Besides, a guide surface 60 for guiding the driven roller 31 (31B and 31C) which has fallen in the setting part 52 to the top surface 51a of the tray main body 51, is formed in an edge part through which the driven roller 31 (31B and 31C)passes in the setting part 52.