PURPOSE: To contrive elongation of life, improvement of reliability and reduction of electric power consumption by a method wherein a plurality of spherical bodies, rolling freely within the rotating range of a movable element, are interposed between the peripheral surfaces of a fixed element and the movable element to reduce frictional resistance between both elements.

CONSTITUTION: The surface of annular wall 14 of the fixed element 11, which is located at the side of a base plate 19 for the movable element 12, is provided with an annular recess 51 in the peripheral direction with equal spaces while a surface, opposing to the annular wall 14 at the peripheral rim part of the base plate 19, is provided with a stepped part 52. The spherical bodies 53 are interposed between the stepped part 52 and the recesses 51 so as to be rolled freely respectively. Spacers 54, 55, formed by a high hardness material, are interposed between respective spherical bodies 53 and the internal surfaces of the recesses 51 and between respective spherical bodies 53 and the stepped part 52. According to this method, even in case a large pushing force, toward the fixed element 11, acts on the movable element 12 during operation of the compressor, this force may be received by the spherical bodies 53, having small frictional coefficient and rolled freely, therefore, frictional resistances in sliding parts may be reduced. Accordingly, elongation of the life of whole of the compressor, improvement of reliability and reduction of electric power consumption may be contrived.