To provide oil-free scroll fluid machinery free of maintenance and having long service life.

In this scroll fluid machinery in which a spiral form compression operation chamber 36 whose volume is sequentially reduced from an outer peripheral side toward an inner peripheral side in accordance with revolution movement preventing rotation of a turning scroll 28 is formed between a fixed scroll 32 and the turning scroll 28 to transfer flow-in gas while compressing it in accordance with the reduction of volume of the compression operation chamber 36, a frequency converter or a driver 60 for driving controlling rotation speed of a motor is provided in a motor casing 10 surrounding a motor rotator 16 fixed to a drive shaft 18 and storing a motor stator 12.