To suggest a small and compact stocking device replacing a tray without stopping a working machine when the tray for storing workpieces supplied at fixed intervals from the working machine becomes full.

In this stocking device 1, hubs 2 supplied at fixed intervals are successively stored in a workpiece storing part 4 of the tray 3. While the tray 3 is replaced with a new empty tray after the tray 3 becomes full, the workpieces 2 are successively and temporarily stored in a plurality of workpiece temporarily placing and storing part 14 of a workpiece temporarily placing part 13. In a state of holding the workpiece storing parts 4 of the number corresponding to the number of the workpieces 2 in the workpiece temporarily placing part 13 in empty states after replacing the tray 3, the hubs 2 are successively stored from the next workpiece storing part 4. By utilizing the workpiece supply intervals, the workpieces 2 in the workpiece temporarily placing part 13 are successively moved to each of the workpiece storing parts 4 held in the empty states.