An air purifier comprising: a body having a cylindrical shape at a portion thereof; a suction unit arranged at a lower portion of the body, having a suction port with a periphery surface that is inclined from a central axis of the body; a discharge unit arranged at an upper portion of the body, having a discharge port with a periphery surface that is inclined from the central axis of the body; a blowing unit arranged within the body, to blow air from the suction unit to the discharge unit; a duct coupled to a top surface of the blowing unit, to guide air blown by the blowing unit to the discharge unit; and a base disposed on a surface, to support the body, wherein the body comprises: a front panel having a partial-cylindrical shape; a rear panel having a partial-cylindrical shape; and an inner panel coupled to the base and provided at a rear side of the front panel, the inner panel having a partial-cylindrical shape, wherein an upper end of the inner panel is coupled to the blowing unit, and wherein the suction unit is arranged at a rear side of the inner panel, the inner panel guiding air introduced through the suction port to flow upwards, characterized in that: the front panel includes, at an inner surface thereof, duct coupling protrusions protruding downwards, and the duct includes, at an outer surface thereof, protrusion receiving members to receive a respective one of the duct coupling protrusions, and the front panel includes a rear panel coupling protrusion at a lateral end of an inner surface thereof, and the rear panel includes, at a lateral end of an inner surface thereof, a protrusion receiving member to receive the rear panel coupling protrusion. a body having a cylindrical shape at a portion thereof; a suction unit arranged at a lower portion of the body, having a suction port with a periphery surface that is inclined from a central axis of the body; a discharge unit arranged at an upper portion of the body, having a discharge port with a periphery surface that is inclined from the central axis of the body; a blowing unit arranged within the body, to blow air from the suction unit to the discharge unit; a duct coupled to a top surface of the blowing unit, to guide air blown by the blowing unit to the discharge unit; and a base disposed on a surface, to support the body, wherein the body comprises: a front panel having a partial-cylindrical shape; a rear panel having a partial-cylindrical shape; and an inner panel coupled to the base and provided at a rear side of the front panel, the inner panel having a partial-cylindrical shape, wherein an upper end of the inner panel is coupled to the blowing unit, and wherein the suction unit is arranged at a rear side of the inner panel, the inner panel guiding air introduced through the suction port to flow upwards, a front panel having a partial-cylindrical shape; a rear panel having a partial-cylindrical shape; and an inner panel coupled to the base and provided at a rear side of the front panel, the inner panel having a partial-cylindrical shape, wherein an upper end of the inner panel is coupled to the blowing unit, and wherein the suction unit is arranged at a rear side of the inner panel, the inner panel guiding air introduced through the suction port to flow upwards, characterized in that: the front panel includes, at an inner surface thereof, duct coupling protrusions protruding downwards, and the duct includes, at an outer surface thereof, protrusion receiving members to receive a respective one of the duct coupling protrusions, and the front panel includes a rear panel coupling protrusion at a lateral end of an inner surface thereof, and the rear panel includes, at a lateral end of an inner surface thereof, a protrusion receiving member to receive the rear panel coupling protrusion. the front panel includes, at an inner surface thereof, duct coupling protrusions protruding downwards, and the duct includes, at an outer surface thereof, protrusion receiving members to receive a respective one of the duct coupling protrusions, and the front panel includes a rear panel coupling protrusion at a lateral end of an inner surface thereof, and the rear panel includes, at a lateral end of an inner surface thereof, a protrusion receiving member to receive the rear panel coupling protrusion.