To provide a gas dissolving membrane device which can be stably operated continuously for a long time and a method of manufacturing a gas-dissolved solution.
A first valve 31 is opened during operation of manufacturing a gas-dissolved water, and a condensate water obtained by condensing process in a gas phase chamber 13 is stored in a reservoir 34 passing through a first valve 31 (a process for reserving condensate water). Next, when the amount of the condensate water measured by a condensate water detection means 35 exceeds a predetermined value, the first valve 31 is closed, and a second valve 32, a third valve 33 and a valve 42 are opened. Further, a sweep gas is supplied to upstream of the reservoir 34 through piping 41, and the condensate water is drained from an outflow part of the reservoir 34 (a process for draining condensate water). After that, the valve 42 and the third valve 33 are closed and a valve 53 is opened by actuating an exhaust device 52, and then the interior of the reservoir 34 is evacuated until the readings of a manometer 54 are equal to the pressure levels measured by the manometer 54 (a process for adjusting pressure). Then, the operation returns to the process of reserving condensate water.
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