A vacuum cleaner comprising: a cleaner body; and a dust collector disposed in the cleaner body, wherein the dust collector comprises: an outer case having a dust storage unit therein; an upper cover mounted to cover an upper portion of the outer case; a lower cover rotatably coupled to a lower portion of the outer case; a first cyclone provided inside the outer case, and having a mesh filter to filter dust and foreign materials from air sucked from outside such that the air without the dust and foreign materials is introduced therein; a second cyclone accommodated in the first cyclone, and configured to separate fine dust from the air introduced into the first cyclone; a cleaning unit configured to sweep dust and foreign materials attached to the mesh filter along an outer circumferential surface of the mesh filter; and a rotation unit coupled to the cleaning unit to relatively rotate the cleaning unit with respect to the mesh filter, wherein the first cyclone comprises a housing formed in a cylindrical shape to surround the second cyclone, and wherein the mesh filter is provided with a plurality of through holes, and protrudes in a radial direction from an upper portion of the housing to extend along a circumferential direction. a cleaner body; and a dust collector disposed in the cleaner body, wherein the dust collector comprises: an outer case having a dust storage unit therein; an upper cover mounted to cover an upper portion of the outer case; a lower cover rotatably coupled to a lower portion of the outer case; a first cyclone provided inside the outer case, and having a mesh filter to filter dust and foreign materials from air sucked from outside such that the air without the dust and foreign materials is introduced therein; a second cyclone accommodated in the first cyclone, and configured to separate fine dust from the air introduced into the first cyclone; a cleaning unit configured to sweep dust and foreign materials attached to the mesh filter along an outer circumferential surface of the mesh filter; and a rotation unit coupled to the cleaning unit to relatively rotate the cleaning unit with respect to the mesh filter, wherein the first cyclone comprises a housing formed in a cylindrical shape to surround the second cyclone, and wherein the mesh filter is provided with a plurality of through holes, and protrudes in a radial direction from an upper portion of the housing to extend along a circumferential direction. an outer case having a dust storage unit therein; an upper cover mounted to cover an upper portion of the outer case; a lower cover rotatably coupled to a lower portion of the outer case; a first cyclone provided inside the outer case, and having a mesh filter to filter dust and foreign materials from air sucked from outside such that the air without the dust and foreign materials is introduced therein; a second cyclone accommodated in the first cyclone, and configured to separate fine dust from the air introduced into the first cyclone; a cleaning unit configured to sweep dust and foreign materials attached to the mesh filter along an outer circumferential surface of the mesh filter; and a rotation unit coupled to the cleaning unit to relatively rotate the cleaning unit with respect to the mesh filter, wherein the first cyclone comprises a housing formed in a cylindrical shape to surround the second cyclone, and wherein the mesh filter is provided with a plurality of through holes, and protrudes in a radial direction from an upper portion of the housing to extend along a circumferential direction.