PURPOSE: To improve lubricating performance and reliability without lengthening a compressor total unit in a vertical direction changed into large size by easily building a compression element.

CONSTITUTION: Three eccentric parts 2a to 2c are provided in a drive shaft 2 in an axial direction, and eccentric directions of the eccentric parts 2a, 2c, positioned in both ends of the drive shaft 2, are displaced in forward/reverse directions at each 120° in a peripheral direction relating to an eccentric direction of the intermediate eccentric part 2b provided in the intermediate part. Further, diameters of the both end eccentric parts 2a, 2c are set so that eccentric directional outside peripheral surfaces of the both end eccentric parts 2a, 2c are positioned in a peripheral surface of the intermediate eccentric part 26. Accordingly, even when the eccentric direction of each eccentric part 2a to 2c is respectively different, in the case of inserting a roller 33b and middle plates 5 into the intermediate eccentric part 2b of the drive shaft 2, the middle plate 5 and the roller 33b, without inserting while displaced in a diametric direction, can be straight inserted in the axial direction, and assembly workability and centering can be improved.