A dust collector (100, 200), 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 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, and configured to form the axial cyclones together with the casings, and the fine dust separating member includes vortex finder (171; 271) disposed in the casings; characterized in that it 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. 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 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, and configured to form the axial cyclones together with the casings, and the fine dust separating member includes vortex finder (171; 271) disposed in the casings; characterized in that it 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. 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, and configured to form the axial cyclones together with the casings, and the fine dust separating member includes vortex finder (171; 271) disposed in the casings; characterized in that it 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. 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.