A refrigerant distribution unit for an air conditioner, comprising: a outdoor-unit-side pipe provided on a side of an outdoor unit and; a plurality of indoor-unit-side pipes (120, 130, 140) respectively provided on sides of indoor units (12, 13, 14); a distribution portion which distributes a refrigerant from the outdoor-unit-side pipe to the plurality of indoor-unit-side pipes (120, 130, 140); a main unit which stores the distribution portion and includes a first side face from which a refrigerant pipe is drawn out, the refrigerant pipe including a gas pipe and a liquid pipe and being connected to the outdoor-unit-side pipe, and a second side face from which a plurality of branch refrigerant pipes (22, 23, 24) are drawn out and connected to the plurality of indoor-unit-side pipes (120,130,140), the second side face being opposed to the first side face; and an electric component box, wherein each of the plurality of branch refrigerant pipes (22, 23, 24) includes a branch gas pipe (220, 230, 240) having a first joint portion (222, 232, 242) and a branch liquid pipe (221, 231, 241) having a second joint portion (223, 233, 243) on the indoor unit side, wherein the branch gas pipes (220, 230, 240) and the branch liquid pipes (221, 231, 241) are drawn out from the second side face of the main unit in such a manner that the branch liquid pipes (221, 231, 241) are respectively disposed downwardly of the branch gas pipes (220, 230, 240) and that the branch gas pipes (220, 230, 240) and the branch liquid pipes (221, 231, 241) are spaced a given distance from each other and are parallel to each other, wherein the first joint portion (222, 232, 242) and second joint portion (223, 233, 243) are disposed in such a manner that the first joint portion (222, 232, 242) and second joint portion (223, 233, 243) are not overlapped with each other, wherein the adjacent branch gas pipes (220, 230, 240) are disposed parallel to each other in such a manner that lengths of the branch gas pipes (220, 230, 240) increase sequentially from one toward the other, wherein the adjacent branch liquid pipes (221, 231, 241) are disposed parallel to each other in such a manner that lengths of the branch liquid pipes (221, 231, 241) increase sequentially from one toward the other, wherein the portion of the gas pipe and the liquid pipe outside the main unit are linear and arranged horizontally and parallel to each other with a constant distance of 40 mm or more, characterized in that the branch liquid pipes (221, 231, 241) are bent upwardly on the near side of the main unit, and in that the branch refrigerant pipes (22, 23, 24) are arranged horizontally and are spaced 40 mm or more from each other. a outdoor-unit-side pipe provided on a side of an outdoor unit and; a plurality of indoor-unit-side pipes (120, 130, 140) respectively provided on sides of indoor units (12, 13, 14); a distribution portion which distributes a refrigerant from the outdoor-unit-side pipe to the plurality of indoor-unit-side pipes (120, 130, 140); a main unit which stores the distribution portion and includes a first side face from which a refrigerant pipe is drawn out, the refrigerant pipe including a gas pipe and a liquid pipe and being connected to the outdoor-unit-side pipe, and a second side face from which a plurality of branch refrigerant pipes (22, 23, 24) are drawn out and connected to the plurality of indoor-unit-side pipes (120,130,140), the second side face being opposed to the first side face; and an electric component box, wherein each of the plurality of branch refrigerant pipes (22, 23, 24) includes a branch gas pipe (220, 230, 240) having a first joint portion (222, 232, 242) and a branch liquid pipe (221, 231, 241) having a second joint portion (223, 233, 243) on the indoor unit side, wherein the branch gas pipes (220, 230, 240) and the branch liquid pipes (221, 231, 241) are drawn out from the second side face of the main unit in such a manner that the branch liquid pipes (221, 231, 241) are respectively disposed downwardly of the branch gas pipes (220, 230, 240) and that the branch gas pipes (220, 230, 240) and the branch liquid pipes (221, 231, 241) are spaced a given distance from each other and are parallel to each other, wherein the first joint portion (222, 232, 242) and second joint portion (223, 233, 243) are disposed in such a manner that the first joint portion (222, 232, 242) and second joint portion (223, 233, 243) are not overlapped with each other, wherein the adjacent branch gas pipes (220, 230, 240) are disposed parallel to each other in such a manner that lengths of the branch gas pipes (220, 230, 240) increase sequentially from one toward the other, wherein the adjacent branch liquid pipes (221, 231, 241) are disposed parallel to each other in such a manner that lengths of the branch liquid pipes (221, 231, 241) increase sequentially from one toward the other, wherein the portion of the gas pipe and the liquid pipe outside the main unit are linear and arranged horizontally and parallel to each other with a constant distance of 40 mm or more, characterized in that the branch liquid pipes (221, 231, 241) are bent upwardly on the near side of the main unit, and in that the branch refrigerant pipes (22, 23, 24) are arranged horizontally and are spaced 40 mm or more from each other.