A conveying system for conveying a workpiece via an opening of a wall disposed between a set area and a processing area, the conveying system comprising: abase (19, 28); and a guide member provided on the base (19, 28); characterized in that the conveying system comprises: a first moving element guided by said guide member, so as to be movable between the set area and the processing area; a second moving element adapted to have a workpiece mounted thereon, and disposed on the first moving element; a support mechanism which supports the second moving element with respect to the first moving element, and has a spring disposed between the first moving element and the second moving element and which supports a weight of at least a part of the second moving element; and a fixing mechanism for fixing the second moving element to the base (19, 28) in the processing area, and having a first mode in which the spring is elastically deformed by applying a predetermined force in addition to the weight of the second moving element, thereby mechanically engaging the base (19, 28) and the second moving element with each other, and a second mode in which the predetermined force on the spring is released, thereby releasing the mechanical engagement between the base (19, 28) and the second moving element. abase (19, 28); and a guide member provided on the base (19, 28); characterized in that the conveying system comprises: a first moving element guided by said guide member, so as to be movable between the set area and the processing area; a second moving element adapted to have a workpiece mounted thereon, and disposed on the first moving element; a support mechanism which supports the second moving element with respect to the first moving element, and has a spring disposed between the first moving element and the second moving element and which supports a weight of at least a part of the second moving element; and a fixing mechanism for fixing the second moving element to the base (19, 28) in the processing area, and having a first mode in which the spring is elastically deformed by applying a predetermined force in addition to the weight of the second moving element, thereby mechanically engaging the base (19, 28) and the second moving element with each other, and a second mode in which the predetermined force on the spring is released, thereby releasing the mechanical engagement between the base (19, 28) and the second moving element. a first moving element guided by said guide member, so as to be movable between the set area and the processing area; a second moving element adapted to have a workpiece mounted thereon, and disposed on the first moving element; a support mechanism which supports the second moving element with respect to the first moving element, and has a spring disposed between the first moving element and the second moving element and which supports a weight of at least a part of the second moving element; and a fixing mechanism for fixing the second moving element to the base (19, 28) in the processing area, and having a first mode in which the spring is elastically deformed by applying a predetermined force in addition to the weight of the second moving element, thereby mechanically engaging the base (19, 28) and the second moving element with each other, and a second mode in which the predetermined force on the spring is released, thereby releasing the mechanical engagement between the base (19, 28) and the second moving element.