A heat exchanger support structure has a heat exchanger, a heat exchanger support supporting the heat exchanger, and motor fan units. The heat exchanger support is integrally formed with motor fan shroud portions allowing the air flow caused by motor fans. Electric motors driving the fans are respectively surrounded by a cylindrical shroud member, which has stays received in holding portions formed on the shroud portion with an elastic member interposed between the stay and the holding portion. This results in that the shroud member, the motor fan unit, and the elastic member function as a dynamic damper.