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A high-pressure chamber (23) in a casing (20) is communicated at the bottom with a liquid storage container (31). A communication tube (34) is connected at its one end to the upper end of the liquid storage container (31) and at the other end to a suction tube (28). In the middle of the communication tube (34) are provided a gas container (35) and a first and a second solenoid valve (36, 37). When the first solenoid valve (36) is closed and the second solenoid valve (37) is opened, the gas container (35) is communicated with the suction tube (28) to reduce the pressure in the gas container (35). After that, the first solenoid valve (36) is opened and the second solenoid valve (37) is closed, so that the gas container (35) is communicated with the liquid storage container (31) to reduce the pressure in the liquid storage container (31). Then the pressure of a lubricant oil in the liquid storage container (31) is reduced and a refrigerant dissolved in the oil gasifies. The structure enables a lubrication failure resulting from oil viscosity deterioration caused by a refrigerant dissolved in a lubricant oil to be avoided and the reliability of an enclosed compressor to be improved. (FIG. 2)