To provide an outdoor machine for an air-conditioner capable of restraining the reduction of an air blasting amount as a whole, improving the reliability by preventing a fan of a lower blower from being caught by ice, and preventing the radiation efficiency from being reduced by securing a large diameter of a fan at a side adjacent to a cooling unit for electric parts.

The inside of an outdoor machine body 1 is partitioned by a partitioning plate 3, a space at one side is used as a heat exchanging chamber 4 provided with an outdoor heat exchanger 8 and blowers 10a, 10b, and a space at the other side is used as a machine chamber 5 provided with a compressor 13 and an electric parts box 16. The blowers are respectively composed of fan motors 11a, 11b and propeller fans 12a, 12b, and two blowers are vertically arranged. A diameter Da of the propeller fan of the upper blower is larger than that Db of the propeller fan of the lower blower.