To prevent lubrication failure at flooded start time by using a rotary shaft parkerized on the surface including the sliding surface with a bearing for journalling the rotary shaft, or using a rotary shaft having a lubricating oil groove on the surface up to the vicinity of an upper motor-driven element from the lower end surface.

When operating a compressor A, a refrigerant flowing in the suction side in a cylinder from a suction pipe 19 is compressed by cooperation of a roller 10 and a vane 12 to pass through a delivery valve 16, a delivery muffler 17 and a motor-driven element 2 to be delivered from a delivery pipe 20. At this time, lubricating oil 18 of a bottom part of a sealed vessel 1 is sucked up by passing through a hollow hole 21 by a vacuum phenomenon by a vortex flow generated on the upper opening end by high speed rotation of a rotary shaft 8 to be supplied to a sliding part. In this case, a phosphate coating film 22 is formed by parkerizing the surface of the rotary shaft 8 including the sliding surface with an upper bearing 13 of the rotary shaft 8 to enhance retentivity of the lubricating oil, and a lubricating oil groove 24 is formed on the surface of the rotary shaft 8 to eliminate lubrication failure at flooded start time.