An air cleaner, comprising: a main body (100a, 100b); and a cylindrical case (101, 201) coupled to an outside of the main body, the cylindrical case having at least one suction inlet (102, 202) through which air is suctioned into the main body (100a, 100b), wherein the main body includes at least one cylindrical filter (120, 220) and at least one filter frame (130, 230) that forms a mounting space for the at least one filter (120, 220), and wherein, when the cylindrical case (101, 201) is opened, the at least one filter (120, 220) is extractable to the outside in a radial direction from the mounting space, wherein the cylindrical case (101, 201) includes a first part (101a, 201a) and a second part (101b, 201b), wherein the first part (101a, 201a) and the second part (101b, 201b) each has a semi-cylindrical shape or a semi-cone shape, characterized in that the air cleaner further includes: a case support provided at a lower side of the cylindrical case (101, 201), the case support including a grill insertion portion into which at least one support projection provided at a lower portion of the cylindrical case (101, 201) is inserted; at least one magnet provided at a upper portion of one of the main body or the cylindrical case (101, 201); and at least one metal piece provided at the other of the main body or the cylindrical case (101, 201), the at least one metal piece being separately coupled to the at least one magnet. a main body (100a, 100b); and a cylindrical case (101, 201) coupled to an outside of the main body, the cylindrical case having at least one suction inlet (102, 202) through which air is suctioned into the main body (100a, 100b), wherein the main body includes at least one cylindrical filter (120, 220) and at least one filter frame (130, 230) that forms a mounting space for the at least one filter (120, 220), and wherein, when the cylindrical case (101, 201) is opened, the at least one filter (120, 220) is extractable to the outside in a radial direction from the mounting space, wherein the cylindrical case (101, 201) includes a first part (101a, 201a) and a second part (101b, 201b), wherein the first part (101a, 201a) and the second part (101b, 201b) each has a semi-cylindrical shape or a semi-cone shape, characterized in that the air cleaner further includes: a case support provided at a lower side of the cylindrical case (101, 201), the case support including a grill insertion portion into which at least one support projection provided at a lower portion of the cylindrical case (101, 201) is inserted; at least one magnet provided at a upper portion of one of the main body or the cylindrical case (101, 201); and at least one metal piece provided at the other of the main body or the cylindrical case (101, 201), the at least one metal piece being separately coupled to the at least one magnet. a case support provided at a lower side of the cylindrical case (101, 201), the case support including a grill insertion portion into which at least one support projection provided at a lower portion of the cylindrical case (101, 201) is inserted; at least one magnet provided at a upper portion of one of the main body or the cylindrical case (101, 201); and at least one metal piece provided at the other of the main body or the cylindrical case (101, 201), the at least one metal piece being separately coupled to the at least one magnet.