A dust removing system which is possible to remove dust (R) strongly adhered to a work (2) surely and is possible to prevent the work (2) from damaging. The dust removing system is provided with an air sucking chamber (4) having an air sucking opening (3) which opens at a position near the work (2), a rotating brushroll (5) disposed inside said air sucking chamber (4) slidable on said work (2), and a nozzle (6) arranged inside said air sucking chamber (4) for sucking and removing dust (R) adhering to the rotating brushroll (5) and to be close to or contact with said rotating brushroll (5). A diameter (D) of said rotating brushroll (5) and an inner width (W) of said air sucking chamber (4) parallel to a traveling direction of said work (2) are arranged to be D ≦ W≦ (D+20mm).