A dust collector, comprising: a cyclone unit (102; 202) formed by a set of axial cyclones (102a, 102b) configured to separate fine dust from air introduced in an axial direction, wherein the set of axial cyclones (102a, 102b) includes: casings (125; 225) each formed to form an outer wall around a hollow portion (125'; 171'; 271'); and a fine dust separating member (170; 270) disposed on the casings (125; 225), and configured to form the axial cyclones (102a, 102b) together with the casings (125; 225), and the fine dust separating member (170; 270) includes; vortex finders (171; 271) disposed in the casings (125; 225); characterized in that the fine dust separating member (170,270) further includes: band portions (172; 272) formed to enclose at least a portion of the outer circumferential surface of the vortex finders (171; 271) at a position spaced from the vortex finders (171; 271), and having a shape corresponding to the casings (125; 225) so as to form outer walls of the axial cyclones (102a, 102b) together with the casings (125; 225) by being mounted on the casings (125; 225); and guide vanes (173; 273) disposed between the vortex finders (171; 271) and the band portions (172; 272), connected to the vortex finders (171; 271) and the band portions (172; 272), and extended in a spiral direction, wherein the vortex finders (171; 271), the band portions (172; 272) and the guide vanes (173; 273) adjacent to each other are formed as an integrated member. a cyclone unit (102; 202) formed by a set of axial cyclones (102a, 102b) configured to separate fine dust from air introduced in an axial direction, wherein the set of axial cyclones (102a, 102b) includes: casings (125; 225) each formed to form an outer wall around a hollow portion (125'; 171'; 271'); and a fine dust separating member (170; 270) disposed on the casings (125; 225), and configured to form the axial cyclones (102a, 102b) together with the casings (125; 225), and the fine dust separating member (170; 270) includes; vortex finders (171; 271) disposed in the casings (125; 225); characterized in that the fine dust separating member (170,270) further includes: band portions (172; 272) formed to enclose at least a portion of the outer circumferential surface of the vortex finders (171; 271) at a position spaced from the vortex finders (171; 271), and having a shape corresponding to the casings (125; 225) so as to form outer walls of the axial cyclones (102a, 102b) together with the casings (125; 225) by being mounted on the casings (125; 225); and guide vanes (173; 273) disposed between the vortex finders (171; 271) and the band portions (172; 272), connected to the vortex finders (171; 271) and the band portions (172; 272), and extended in a spiral direction, wherein the vortex finders (171; 271), the band portions (172; 272) and the guide vanes (173; 273) adjacent to each other are formed as an integrated member. casings (125; 225) each formed to form an outer wall around a hollow portion (125'; 171'; 271'); and a fine dust separating member (170; 270) disposed on the casings (125; 225), and configured to form the axial cyclones (102a, 102b) together with the casings (125; 225), and the fine dust separating member (170; 270) includes; vortex finders (171; 271) disposed in the casings (125; 225); characterized in that the fine dust separating member (170,270) further includes: band portions (172; 272) formed to enclose at least a portion of the outer circumferential surface of the vortex finders (171; 271) at a position spaced from the vortex finders (171; 271), and having a shape corresponding to the casings (125; 225) so as to form outer walls of the axial cyclones (102a, 102b) together with the casings (125; 225) by being mounted on the casings (125; 225); and guide vanes (173; 273) disposed between the vortex finders (171; 271) and the band portions (172; 272), connected to the vortex finders (171; 271) and the band portions (172; 272), and extended in a spiral direction, wherein the vortex finders (171; 271), the band portions (172; 272) and the guide vanes (173; 273) adjacent to each other are formed as an integrated member. band portions (172; 272) formed to enclose at least a portion of the outer circumferential surface of the vortex finders (171; 271) at a position spaced from the vortex finders (171; 271), and having a shape corresponding to the casings (125; 225) so as to form outer walls of the axial cyclones (102a, 102b) together with the casings (125; 225) by being mounted on the casings (125; 225); and guide vanes (173; 273) disposed between the vortex finders (171; 271) and the band portions (172; 272), connected to the vortex finders (171; 271) and the band portions (172; 272), and extended in a spiral direction, wherein the vortex finders (171; 271), the band portions (172; 272) and the guide vanes (173; 273) adjacent to each other are formed as an integrated member.