A conveyance system (1, 1A-1D) comprising: a conveyance robot (4, 4B, 4D) configured to move and convey a workpiece in a horizontal direction; a suspending device (3, 3A-3D) including a suspending mechanism configured to suspend the workpiece, a lifting unit configured to lift up and down the workpiece suspended by the suspending mechanism, and a support mechanism configured to support the suspending mechanism such that the suspending mechanism is movable in the horizontal direction; a first controller configured to control a lifting operation of the workpiece by the lifting unit of the suspending device (3, 3A-3D); and a second controller configured to control a conveyance operation of the workpiece by the conveyance robot (4,4B,4D), wherein: the conveyance robot (4,4B,4D) includes a guide part configured to guide the workpiece and moves the guide part in the horizontal direction and an upper-lower direction to convey the workpiece; the first controller and the second controller cause the lifting operation of the workpiece by the lifting unit and the upper-lower movement operation of the guide part by the conveyance robot (4,4B,4D) to be synchronized with each other; and the first controller controls the lifting operation of the lifting unit based on a control command transmitted from the second controller. a conveyance robot (4, 4B, 4D) configured to move and convey a workpiece in a horizontal direction; a suspending device (3, 3A-3D) including a suspending mechanism configured to suspend the workpiece, a lifting unit configured to lift up and down the workpiece suspended by the suspending mechanism, and a support mechanism configured to support the suspending mechanism such that the suspending mechanism is movable in the horizontal direction; a suspending mechanism configured to suspend the workpiece, a lifting unit configured to lift up and down the workpiece suspended by the suspending mechanism, and a support mechanism configured to support the suspending mechanism such that the suspending mechanism is movable in the horizontal direction; a first controller configured to control a lifting operation of the workpiece by the lifting unit of the suspending device (3, 3A-3D); and a second controller configured to control a conveyance operation of the workpiece by the conveyance robot (4,4B,4D), wherein: the conveyance robot (4,4B,4D) includes a guide part configured to guide the workpiece and moves the guide part in the horizontal direction and an upper-lower direction to convey the workpiece; the first controller and the second controller cause the lifting operation of the workpiece by the lifting unit and the upper-lower movement operation of the guide part by the conveyance robot (4,4B,4D) to be synchronized with each other; and the first controller controls the lifting operation of the lifting unit based on a control command transmitted from the second controller. the conveyance robot (4,4B,4D) includes a guide part configured to guide the workpiece and moves the guide part in the horizontal direction and an upper-lower direction to convey the workpiece; the first controller and the second controller cause the lifting operation of the workpiece by the lifting unit and the upper-lower movement operation of the guide part by the conveyance robot (4,4B,4D) to be synchronized with each other; and the first controller controls the lifting operation of the lifting unit based on a control command transmitted from the second controller.