A purge stocker for purging the inside of at least one of a plurality of storage containers storing a product with purge gas, the purge stocker comprising: a first supply unit including N first purge apparatuses (N is an integer equal to or larger than 2) each having a first supporting unit configured to support one of the plurality of storage containers,a first supply pipe configured to supply the purge gas into the one of the plurality of containers supported by the first supporting unit, and a first flow rate adjusting unit configured to measure a mass flow rate of the purge gas in the first supply pipe and individually provide flow rate control; a second supply unit including M second purge apparatuses (M is a positive integer between 2 and N, inclusive) each having a second supporting unit configured to support one of the plurality of storage containers and a second supply pipe configured to supply the purge gas into the one of the plurality of the storage containers supported by the second supporting unit, a main pipe connected with each of the second supply pipes and configured to supply the purge gas to the second supply pipes, wherein a second flow rate adjusting unit is configured to measure a mass flow rate of the purge gas in the main pipe and provide collective flow rate control; and a transferring device is configured to transfer the storage container between the first supply unit and the second supply unit, wherein the second flow rate adjusting unit collectively controls a flow rate of the purge gas supplied from the second supply pipes of the M second purge apparatuses to the storage containers, and the second supply unit supplies the storage containers with the purge gas through the second supply pipes when the storage containers are supported by the second supporting units. a first supply unit including N first purge apparatuses (N is an integer equal to or larger than 2) each having a first supporting unit configured to support one of the plurality of storage containers,a first supply pipe configured to supply the purge gas into the one of the plurality of containers supported by the first supporting unit, and a first flow rate adjusting unit configured to measure a mass flow rate of the purge gas in the first supply pipe and individually provide flow rate control; a second supply unit including M second purge apparatuses (M is a positive integer between 2 and N, inclusive) each having a second supporting unit configured to support one of the plurality of storage containers and a second supply pipe configured to supply the purge gas into the one of the plurality of the storage containers supported by the second supporting unit, a main pipe connected with each of the second supply pipes and configured to supply the purge gas to the second supply pipes, wherein a second flow rate adjusting unit is configured to measure a mass flow rate of the purge gas in the main pipe and provide collective flow rate control; and a transferring device is configured to transfer the storage container between the first supply unit and the second supply unit, wherein the second flow rate adjusting unit collectively controls a flow rate of the purge gas supplied from the second supply pipes of the M second purge apparatuses to the storage containers, and the second supply unit supplies the storage containers with the purge gas through the second supply pipes when the storage containers are supported by the second supporting units.