<；P>；PROBLEM TO BE SOLVED: To provide a gas dissolving apparatus capable of efficiently dissolving a gas without the need of a large tank, depressurizing a gas solution without clogging even when a foreign matter is mixed in, preventing the generation of air bubbles and obtaining the stable gas solution of a high concentration. <；P>；SOLUTION: The gas dissolving apparatus comprises: a pressurizing part 1 for forcibly feeding a liquid； a gas injection part 2 for injecting the gas to the liquid； a pressure dissolving part 3 for dissolving the gas in the liquid by pressurization by the forcible feed of the liquid to which the gas is injected in the pressurizing part 1； and a depressurizing part 4 for depressurizing the pressure of the gas solution in which the gas is dissolved in the pressure dissolving part 3 to the atmospheric pressure successively from the inflow side to the outflow side of the gas solution. The respective parts of the pressurizing part 1, the gas injection part 2 and the pressure dissolving part 3 are continuously operated, the gas solution is continuously supplied to the depressurizing part 4, and the gas solution without the generation of the air bubbles is continuously discharged from the outflow side of the depressurizing part 4. <；P>；COPYRIGHT: (C)2008,JPO&INPIT
