To provide a manufacturing line carrying instruction controlling method capable of reducing the number of times of issuing carrying instructions and efficiently executing carrying control.

On a manufacturing line provided with plural buffers 1-6 for temporarily storing processing lots, each process forms a device group including plural processors of the same kind and the waiting time from the processing completion of a processing lot up to its carrying-out is defined for every device group to be a carrying-out source of the processing lot and to be a carrying-out destination.