An outdoor unit of an air conditioner, the outdoor unit comprising: a case configured to form a front surface and a rear surface and an exterior of a circumferential surface between the front surface and the rear surface, and being divided into a mechanical room and a heat exchange space by a barrier; a blower fan disposed in the heat exchange space to suction in air in the axial direction and discharge in the circumferential direction; an outdoor heat exchanger disposed to cover an open rear surface of the case and to allow a heat exchange to occur between air suctioned through the rear surface of the case and refrigerant; discharge grilles (15, 16) formed at a portion of the circumferential surface of the case including an upper surface of the case and having a plurality of outlets to allow the heat-exchanged air to be discharged in the circumferential direction; and an orifice member disposed to divide the blower fan and the outdoor heat exchanger and guide the air that has passed through the outdoor heat exchanger toward the blower fan while simultaneously guiding the air discharged by the blower fan toward the plurality of outlets, the orifice member comprises: a compartmentalizing unit configured to divide the heat exchange space; an inlet opened by penetrating the compartmentalizing unit; and a guide unit extending toward the blower fan along a circumference of the inlet, wherein the guide unit is extended to be inserted into the inside of an opening formed at a front surface of the blower fan, the outdoor unit being characterized in that the guide unit comprises: a first guide surface configured to form an inner circumferential surface of the guide unit and formed to be rounded with a predetermined curvature; and a second guide surface configured to form an outer circumferential surface of the guide unit and formed to have a smaller curvature than the first guide surface. a case configured to form a front surface and a rear surface and an exterior of a circumferential surface between the front surface and the rear surface, and being divided into a mechanical room and a heat exchange space by a barrier; a blower fan disposed in the heat exchange space to suction in air in the axial direction and discharge in the circumferential direction; an outdoor heat exchanger disposed to cover an open rear surface of the case and to allow a heat exchange to occur between air suctioned through the rear surface of the case and refrigerant; discharge grilles (15, 16) formed at a portion of the circumferential surface of the case including an upper surface of the case and having a plurality of outlets to allow the heat-exchanged air to be discharged in the circumferential direction; and an orifice member disposed to divide the blower fan and the outdoor heat exchanger and guide the air that has passed through the outdoor heat exchanger toward the blower fan while simultaneously guiding the air discharged by the blower fan toward the plurality of outlets, the orifice member comprises: a compartmentalizing unit configured to divide the heat exchange space; an inlet opened by penetrating the compartmentalizing unit; and a guide unit extending toward the blower fan along a circumference of the inlet, wherein the guide unit is extended to be inserted into the inside of an opening formed at a front surface of the blower fan, the outdoor unit being characterized in that the guide unit comprises: a first guide surface configured to form an inner circumferential surface of the guide unit and formed to be rounded with a predetermined curvature; and a second guide surface configured to form an outer circumferential surface of the guide unit and formed to have a smaller curvature than the first guide surface. a compartmentalizing unit configured to divide the heat exchange space; an inlet opened by penetrating the compartmentalizing unit; and a guide unit extending toward the blower fan along a circumference of the inlet, wherein the guide unit is extended to be inserted into the inside of an opening formed at a front surface of the blower fan, the outdoor unit being characterized in that the guide unit comprises: a first guide surface configured to form an inner circumferential surface of the guide unit and formed to be rounded with a predetermined curvature; and a second guide surface configured to form an outer circumferential surface of the guide unit and formed to have a smaller curvature than the first guide surface. a first guide surface configured to form an inner circumferential surface of the guide unit and formed to be rounded with a predetermined curvature; and a second guide surface configured to form an outer circumferential surface of the guide unit and formed to have a smaller curvature than the first guide surface.