provided is an outdoor unit of an air conditioner capable of obtaining stable air blowing performance without enlarging a blower fan and decreasing the amount of air per unit area passing through the heat exchanger even if the capacity of the heat exchanger is enlarged by optimizing a relative arrangement and a configuration of a heat exchanger and a blower and effectively utilizing the wind of the blower which is conventionally wasted . the rotation shaft of the first blower is disposed closer to the center line in the lateral direction of the housing than the center line in a lateral direction of the left blower chamber , and the rotation shaft of the second blower is disposed closer to the center line in the lateral direction of the housing than the center line in a lateral direction of the right blower chamber .