A dust collector , comprising: a first cyclone formed by an outer case and an inner case provided inside the outer case , the outer case having a first air inlet on a side, the inner case having a width larger at a top than a bottom of the inner case , the first cyclone being configured to separate first foreign materials from air introduced through the first air inlet ; and a secondary cyclone formed by a plurality of hollow bodies to separate second foreign materials from air which has passed through the first cyclone , each hollow body having a width larger at a top than a bottom of the hollow body, and the first foreign materials having a larger dimension than the second foreign materials, wherein a cyclonic airflow is provided in an axial direction of the hollow bodies from above the top of the hollow bodies; a plurality of guide vanes provided over the top of the hollow bodies to initiate the cyclonic airflow and to introduce the cyclonic airflow from above the hollow bodies; and a vortex finder protruding from inside of each of the hollow bodies such that at least one guide vane is provided between adjacent vortex finders , and the vortex finders are connected to the guide vanes , characterized by : a plurality of inner bands , each surrounding a corresponding vortex finder and guide vane , and adjacent inner bands being connected to each other; and an outer band surrounding the plurality of inner bands , the outer band contacting inner bands adjacent to the outer band , wherein the vortex finders , the inner bands , the guide vanes , and the outer band mean the respective parts of a fine dust separating member . a first cyclone formed by an outer case and an inner case provided inside the outer case , the outer case having a first air inlet on a side, the inner case having a width larger at a top than a bottom of the inner case , the first cyclone being configured to separate first foreign materials from air introduced through the first air inlet ; and a secondary cyclone formed by a plurality of hollow bodies to separate second foreign materials from air which has passed through the first cyclone , each hollow body having a width larger at a top than a bottom of the hollow body, and the first foreign materials having a larger dimension than the second foreign materials, wherein a cyclonic airflow is provided in an axial direction of the hollow bodies from above the top of the hollow bodies; a plurality of guide vanes provided over the top of the hollow bodies to initiate the cyclonic airflow and to introduce the cyclonic airflow from above the hollow bodies; and a vortex finder protruding from inside of each of the hollow bodies such that at least one guide vane is provided between adjacent vortex finders , and the vortex finders are connected to the guide vanes , characterized by : a plurality of inner bands , each surrounding a corresponding vortex finder and guide vane , and adjacent inner bands being connected to each other; and an outer band surrounding the plurality of inner bands , the outer band contacting inner bands adjacent to the outer band , wherein the vortex finders , the inner bands , the guide vanes , and the outer band mean the respective parts of a fine dust separating member . a plurality of inner bands , each surrounding a corresponding vortex finder and guide vane , and adjacent inner bands being connected to each other; and an outer band surrounding the plurality of inner bands , the outer band contacting inner bands adjacent to the outer band , wherein the vortex finders , the inner bands , the guide vanes , and the outer band mean the respective parts of a fine dust separating member . <EOS>