with each other and a housing 104 at the motor side and a fixed scroll 113 are connected to each other with screws 118 in fig5 numeral 111 indicates a revolution scroll 112 a scroll lap standing upright on the surface of the end plate of the revolution scroll 111 113 a fixed scroll and 114 a scroll lap standing upright on the surface of the table top plate of the fixed scroll these laps 112 and 114 comprise involute curves and are combined so that the lap portions are engaged with each other numeral 115 indicates a gas leakage prevention packing installed at the tip of each lap numeral 102 indicates a rotary shaft for transferring the driving force of the motor 101 and 102a an eccentric part thereof hereinafter just referred to as an eccentric shaft the boss portion of the revolution scroll 111 is attached to the eccentric shaft 102a via a ball bearing 103 so that it can rotate numeral 116 indicates a hollow and circular slide plate 117 a pair of x axial linear slide bearings installed on the slide plate 116 on the side of the revolution scroll 111 these bearings constitute a means for controlling the rotation of the revolution scroll 111 on its axis when the eccentric shaft 102a rotates for allowing the revolution scroll 111 to revolve on a circular orbit with an eccentric radius and for allowing the revolution scroll 111 to rotate around the fixed scroll 113 together with y axial linear slide bearings a pair of bearings are installed on the slide plate 116 on the side of the motor 101 which are not shown in the drawing in the scroll air compressor having the aforementioned constitution gas is suctioned into the pump from a.