To continuously operate even at carrying in/out of empty trays or occupied trays, a carrying in/out device for carrying in stacked empty trays, automatically arranging packaging bags to the empty trays taken out one by one, and again stacking to carry out.

A carry-in part is provided with carriage supportedly guiding members 23 supporting a carriage 22 loaded with stacked empty trays 24a at the height not interfering with an empty tray 24a1 on a transport face H to guide an a conveyor belt 28, and tray supporting members 25 for supporting the carried-in empty trays 24a. The carriage supportedly guiding member 23 is set movable between the position at with the carriage is supportedly guided and a refuge position not interfering which elevatable movement of the trays, and the tray supporting members 25 is set movable between the position at which the trays are supported and a refuge position not interfering with the trays and elevatable. The empty tray 24a1 on the lower part of the carry-in part, the occupied tray on the lower part of the carry-out part, can be respectively pooled by each one sheet.