According to one aspect of the present disclosure, because there is no need for a user to pick dust or the like adhered to an outer circumferential surface of the grill off by hand, the vacuum cleaner is easy to use. In addition, when removing dust or the like adhered to an outer circumferential surface of the grill, generation of secondary contamination around the case can be prevented.A cyclone dust collector, the cyclone dust collector comprises a case configured to accommodate dust separated from suctioned air, a first cover configured to open, and close a bottom of the case and a grill assembly provided to be detachable from the case.