A dust collector for a vacuum cleaner disclosed herein includes a first cyclone that is configured to separate dust from air introduced from a lower portion thereof with containing foreign materials and discharge the separated dust into a first dust storing unit, a second cyclone that is configured to separate fine dust from the air, from which the dust has been separated by the first cyclone, and discharge the separated fine dust into a second dust storing unit defined in a second case, and a lower cover that is coupled to the first case by a hinge so as to define a bottom surface of the first dust storing unit, the second dust storing unit and the first cyclone upon being closed, and discharge therethrough the foreign materials collected in the first dust storing unit, the second dust storing unit and the first cyclone upon being open.