To eliminate a reduction in discharge amount of a vane fluid machine having a plurality of independent discharge ports in one discharge region, improve the precision of a divided flow, offer simple machining of parts to be used and enable displacement easily variable, and facilitate formation of the divided flow of stable and selective frequency and quantity.

The vane fluid machine 40 having operation chambers 7, 8 formed with a rotor 1, vanes 3, a ring 4 and side plates 5, 6 comprises first communication paths 20, 21 having discharge opening portions 20, 21 communicating with plurality of discharge ports 10, 11 connectable to a plurality of fluid operating systems 14, 15 mutually independent and opening to the side face of the rotor, and second communication paths 24 communicating with the first communication paths and opening to the operation chambers, both of which are provided for the individual vanes with the first opening communicating with one of the plurality of discharge opening portions with the rotation of the rotor. The plurality of discharge opening portions are provided at positions where the side plates have different diameters in the radial direction and the first opening is arranged in zigzag in the radial direction of discharge opening side faces 1c, 1d of the rotor.