an ejector system for a color sorter , eliminates particulate matter by air by detection of the particulate matter falling from an end of a transfer device at a predetermined position , and has a nozzle part in which a plurality of air flow paths that communicate with a plurality of nozzle holes are formed . a manifold part is provided with a plurality of electromagnetic valves that communicate with an air space communicating with a compressed air source and in which a plurality of air flow paths for supplying compressed air to the corresponding air flow paths in the nozzle part by the operation of the respective electromagnetic valves are formed . the nozzle part and the manifold part are separably integrated while open surfaces of the air flow paths in the nozzle part and open surfaces of the air flow paths in the manifold part are brought into contact with each other .