Disclosed is a cyclone dust collector in which usability is improved. A vacuum cleaner comprising a cyclone dust collector, wherein the cyclone dust collector includes, a case configured to swirl suctioned air to separate dust from the suctioned air and accommodate the separated dust, a grill assembly separably installed in the case, and a cleaning portion included in the case and configured to remove dust adhered to a surface of the grill assembly when the grill assembly is separated from the case.