A device for supplying water containing dissolved gas includes a gas permeable film module that is partitioned into a gas phase chamber having a connection port at a bottom part and a liquid phase chamber by a gas permeable film, a feed unit feeding water to be treated to the liquid phase chamber, a gas supply unit supplying gas to the gas phase chamber, and a vacuum evacuation unit, connected with the gas phase chamber with the connection port, so that the gas is supplied to the gas phase chamber by the gas supply unit while the gas phase chamber is evacuated by the vacuum evacuation unit.