A twin laundry machine comprising: a first washing unit comprising a first tub, a first drum and a first drive unit for driving the first drum; and a second washing unit comprising a second tub, a second drum and a second drive unit for driving the second drum, wherein the second drum has a diameter which is larger than the height, and a rotation axis which intersects a rotation axis of the first drum, wherein the second drive unit comprises: a stator fixed to an outer surface of a bottom wall of the second tub; and a rotor coupled to the drum shaft and rotatably surrounding the stator, wherein the rotor comprises a rotor frame, a magnet, and a connector for connecting the rotor frame and the drum shaft with each other, the rotor frame comprising, a side wall for seating the magnet therein, a bottom wall horizontally extended from a lower end of the side wall, and a plurality of air inlet parts formed in the bottom wall, characterized in that the air inlet part comprises: an external air inlet channel projected from the bottom wall toward the stator, and an external air supply channel in communication with the external air inlet channel, the external air supply channel being formed in the circumferential direction and projected from the bottom wall, the external air supply channel comprising a radial-direction inner wall formed consecutively along the circumferential direction, an external wall, an upper wall connecting the inner wall and a top of the external wall with each other; wherein the external wall comprises an inclined wall having one end of the inclined external wall (361a, 345) being formed outer or inner to the other end in a radial direction, and a circumferential-direction wall (361b, 345), and an opening formed by the inclined external wall, the circumferential-direction wall and the upper wall and through which external air is sucked into the rotor frame. a first washing unit comprising a first tub, a first drum and a first drive unit for driving the first drum; and a second washing unit comprising a second tub, a second drum and a second drive unit for driving the second drum, wherein the second drum has a diameter which is larger than the height, and a rotation axis which intersects a rotation axis of the first drum, wherein the second drive unit comprises: a stator fixed to an outer surface of a bottom wall of the second tub; and a rotor coupled to the drum shaft and rotatably surrounding the stator, a stator fixed to an outer surface of a bottom wall of the second tub; and a rotor coupled to the drum shaft and rotatably surrounding the stator, wherein the rotor comprises a rotor frame, a magnet, and a connector for connecting the rotor frame and the drum shaft with each other, the rotor frame comprising, a side wall for seating the magnet therein, a bottom wall horizontally extended from a lower end of the side wall, and a plurality of air inlet parts formed in the bottom wall, characterized in that the air inlet part comprises: an external air inlet channel projected from the bottom wall toward the stator, and an external air supply channel in communication with the external air inlet channel, the external air supply channel being formed in the circumferential direction and projected from the bottom wall, the external air supply channel comprising a radial-direction inner wall formed consecutively along the circumferential direction, an external wall, an upper wall connecting the inner wall and a top of the external wall with each other; wherein the external wall comprises an inclined wall having one end of the inclined external wall (361a, 345) being formed outer or inner to the other end in a radial direction, and a circumferential-direction wall (361b, 345), and an opening formed by the inclined external wall, the circumferential-direction wall and the upper wall and through which external air is sucked into the rotor frame. an external air inlet channel projected from the bottom wall toward the stator, and an external air supply channel in communication with the external air inlet channel, the external air supply channel being formed in the circumferential direction and projected from the bottom wall, the external air supply channel comprising a radial-direction inner wall formed consecutively along the circumferential direction, an external wall, an upper wall connecting the inner wall and a top of the external wall with each other; wherein the external wall comprises an inclined wall having one end of the inclined external wall (361a, 345) being formed outer or inner to the other end in a radial direction, and a circumferential-direction wall (361b, 345), and an opening formed by the inclined external wall, the circumferential-direction wall and the upper wall and through which external air is sucked into the rotor frame.