Cyclone dust-separating unit for use in vacuum cleaner

A cyclone dust-separating unit is provided that includes a whirling current generating unit to rotate air drawn in through a suction nozzle, and a dust collecting bin having opened and closed ends to collect and store dust separated by a whirling current. The generating unit and the bin are separate tube members, and the generating unit includes a cyclone body having a first end with an air inlet and a second end with an air outlet, a spiral guide member on the first end to guide air flowed in through the air inlet in a spiral shape, an outflow pipe on the second end to extend to the outside of the cyclone body while penetrating through the air outlet, and a dust guide to connect a dust discharging opening with the opened end and to guide dust or dirt discharged through the dust discharging opening, to the opened end.