Conveying system and processing system

The present invention provides a transport system capable of carrying in and out a plurality of trays while suppressing the burden of an operator. A conveyance system (1) is provided with: a first trolley (9) for providing unloaded trays on which a plurality of unloaded trays (20A) on which no display panel (100) is placed are stacked; a first elevator (3) capable of adjusting the height position of the plurality of empty trays (20A); a second carriage (10) for discharging load trays on which a plurality of load trays (20B) on which the display panel (100) is placed are stacked; a second elevator (4) capable of adjusting the height position of the plurality of load trays (20B); a first tray transport mechanism (5) that transports the uppermost empty tray (20A) among the plurality of empty trays (20A) on the first trolley (9) stopped at the empty tray supply position (9A) on the plurality of load trays (20B) on the second trolley (10) stopped at the load tray discharge position (10A) in order to stack the uppe