A dust collector (100, 200), comprising: a first cyclone formed by an outer case (110, 210) and an inner case (121, 221) provided inside the outer case (110, 210), the outer case (110, 210) having a first air inlet (111, 211) on a side, the inner case (121, 221) having a width larger at a top than a bottom of the inner case (121, 221), the first cyclone being configured to separate first foreign materials from air introduced through the first air inlet (111, 211); 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 (173, 273) 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 (171, 271) protruding from inside of each of the hollow bodies such that at least one guide vane (173, 273) is provided between adjacent vortex finders (171, 271), and the vortex finders (171, 271) are connected to the guide vanes (173, 273), characterized by: a plurality of inner bands (172, 272), each surrounding a corresponding vortex finder (171, 271) and guide vane (173, 273), and adjacent inner bands (172, 272) being connected to each other; and an outer band (174, 274) surrounding the plurality of inner bands (172, 272), the outer band (174, 274) contacting inner bands (172, 272) adjacent to the outer band (174,274), wherein the vortex finders (171, 271), the inner bands (172, 272), the guide vanes (173, 273), and the outer band (174, 274) mean the respective parts of a fine dust separating member (170, 270). a first cyclone formed by an outer case (110, 210) and an inner case (121, 221) provided inside the outer case (110, 210), the outer case (110, 210) having a first air inlet (111, 211) on a side, the inner case (121, 221) having a width larger at a top than a bottom of the inner case (121, 221), the first cyclone being configured to separate first foreign materials from air introduced through the first air inlet (111, 211); 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 (173, 273) 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 (171, 271) protruding from inside of each of the hollow bodies such that at least one guide vane (173, 273) is provided between adjacent vortex finders (171, 271), and the vortex finders (171, 271) are connected to the guide vanes (173, 273), characterized by: a plurality of inner bands (172, 272), each surrounding a corresponding vortex finder (171, 271) and guide vane (173, 273), and adjacent inner bands (172, 272) being connected to each other; and an outer band (174, 274) surrounding the plurality of inner bands (172, 272), the outer band (174, 274) contacting inner bands (172, 272) adjacent to the outer band (174,274), wherein the vortex finders (171, 271), the inner bands (172, 272), the guide vanes (173, 273), and the outer band (174, 274) mean the respective parts of a fine dust separating member (170, 270). a plurality of inner bands (172, 272), each surrounding a corresponding vortex finder (171, 271) and guide vane (173, 273), and adjacent inner bands (172, 272) being connected to each other; and an outer band (174, 274) surrounding the plurality of inner bands (172, 272), the outer band (174, 274) contacting inner bands (172, 272) adjacent to the outer band (174,274), wherein the vortex finders (171, 271), the inner bands (172, 272), the guide vanes (173, 273), and the outer band (174, 274) mean the respective parts of a fine dust separating member (170, 270).