A scroll type fluid displacement apparatus is disclosed. The scroll type fluid displacement apparatus includes a housing, a fixed scroll and an orbiting scroll both of which having an end plate from which wrap extends. Both wraps interfit to make a plurality of line contacts to define at least one sealed off fluid pocket. A drive shaft is rotatably supported by the housing, and has a drive pin which is radially offset from the axis of the drive shaft. The end plate of orbiting scroll has a boss, and a bushing is rotatably supported within the boss. The bushing has an eccentric hole disposed eccentrically with respect to the center of the bushing, and the drive pin is inserted in the eccentric hole. The bushing also has a balanceweight which causes a centrifugal force which is slightly larger than the centrifugal force which arises by orbital motion of the orbiting scroll and other orbital parts to improve the wearing of the wrap in the high speed operation of the apparatus.