A power-supply management device, comprising: a power-supply-connecting/disconnecting section configured to connect/disconnect power supply to a plurality of electric-powered sections (9, 9a, 11-14, 16-18, 11a-14a, 16a-18a) operating in processing of a material,: and a comparator (29, 31) configured to compare an operation time of each electric-powered section during the processing of the material, and detect an electric-powered section which does not require operation, wherein the power-supply-connecting/disconnecting section is configured to disconnect the power supply to the electric-powered section which does not require the operation during the processing based on information from the comparator, charactenzed in that when a program controlling each of the electric-powered sections (9, 9a, 11-14, 16-18, 11a-14a, 16a-18a) has a plurality of synchronization commands for instructing synchronization of each control operation by the electric-powered sections, the comparator (29, 31) is configured to detect a plurality of synchronization commands, and detect or calculate the operation time of each of the electric-powered sections between the synchronization commands, and set the operation time as the operation time of each of the electric-powered sections between the synchronizations, the comparator (29, 31) is configured to compare the operation time between synchronizations of each of the electric-powered sections, and detect the electric-powered section which does not require the operation when each of the electric-powered sections operates before and after synchronization, the comparator (29,31) is configured to compare the operation time of each of the electric-powered sections between the synchronizations, and determine an electric-powered section except an electric-powered section having the maximum operation time between the synchronizations as an electric-powered section which does not require the operation, and the power-supply-connecting/disconnecting section is configured to disconnect the power supply to the electric-powered section which does not require the operation after the end of the operation between the synchronizations. a power-supply-connecting/disconnecting section configured to connect/disconnect power supply to a plurality of electric-powered sections (9, 9a, 11-14, 16-18, 11a-14a, 16a-18a) operating in processing of a material,: and a comparator (29, 31) configured to compare an operation time of each electric-powered section during the processing of the material, and detect an electric-powered section which does not require operation, wherein the power-supply-connecting/disconnecting section is configured to disconnect the power supply to the electric-powered section which does not require the operation during the processing based on information from the comparator, charactenzed in that when a program controlling each of the electric-powered sections (9, 9a, 11-14, 16-18, 11a-14a, 16a-18a) has a plurality of synchronization commands for instructing synchronization of each control operation by the electric-powered sections, the comparator (29, 31) is configured to detect a plurality of synchronization commands, and detect or calculate the operation time of each of the electric-powered sections between the synchronization commands, and set the operation time as the operation time of each of the electric-powered sections between the synchronizations, the comparator (29, 31) is configured to compare the operation time between synchronizations of each of the electric-powered sections, and detect the electric-powered section which does not require the operation when each of the electric-powered sections operates before and after synchronization, the comparator (29,31) is configured to compare the operation time of each of the electric-powered sections between the synchronizations, and determine an electric-powered section except an electric-powered section having the maximum operation time between the synchronizations as an electric-powered section which does not require the operation, and the power-supply-connecting/disconnecting section is configured to disconnect the power supply to the electric-powered section which does not require the operation after the end of the operation between the synchronizations.