A conveying operation method and device that can continue an operation on a workpiece to prevent reduction in production efficiency in conveying a workpiece and performing an operation on the workpiece even if conveyance of the workpiece is stopped during the operation on the workpiece. The workpiece is conveyed by a workpiece conveying device, a movable stand is moved in synchronization with the workpiece conveying device in operation areas along a conveying path, and an operation is performed on the workpiece by an operation device provided on the movable stand. When movement of the workpiece conveying device is stopped, the movable stand stops in synchronization with the workpiece conveying device to continue the operation on the workpiece and complete one cycle operation. When non-normal operation is performed on the workpiece, the workpiece is retracted to a position different from the conveying path while being supported by the movable stand.