To facilitated, the reliability and assembly as a compressor for compressing a suitable fluid such as air conditioner, refrigerator and the rotary shaft, it is possible to reduce a volume formed between the compression member to fluid pressure in the volume, at least one compression member the relatively high-pressure chamber, the internal pressure is lower than the pressure of the relatively high pressure chamber lubrication for receiving a pressurized fluid and the lubricating oil discharged from the compression mechanism, the compression mechanism comprises a pair of compression members euhae driving the line shaft to flow from the relatively high pressure chamber incoming relatively low pressure chamber, supporting the rotary shaft in it and includes an outer peripheral surface on the sphere, that the shaft end is in contact with the relatively high pressure chamber that axis other jjokkkeut is relatively in contact with the low-pressure chamber a self-aligning roller bearing, the outer peripheral surface is possible slipping the spherical a self-aligning bearing housing containing the spherical inner peripheral surface on the fitted Is formed on at least one of the outer peripheral surface on the inner surface and the spherical spherical, and providing the inclusions to a low-pressure chamber is relatively open and prevent opening of the relatively high pressure chamber. Plastic deformation of the welding portion caused by the welding process by using such a compressor does not degrade the fitting condition of the contact area.