To provide an air-cooled heat exchanger 2 that can air-cool second cooling water by a second radiator 6 to 65°C or less even if the second radiator 6 is integrated with a first radiator 5 for space saving, in an air-cooled heat exchanger 2 for a hybrid automobile 1 including an outdoor heat exchanger 4 with a refrigeration cycle 3, the first radiator 5 and the second radiator 6.

An outdoor heat exchanger 4 is placed only on the upstream side in the direction of air-cooling stream from the first radiator 5 so that air-cooling stream that has not been radiated by refrigerant flows into the second radiator 6. Accordingly, even if the first radiator 5 is integrated with the second radiator 6 for space-saving, the second cooling-water can be cooled to 65°C or less by the second radiator 6.