Provided is a heat exchange device that facilitate assembling of a plurality of heat exchangers. The heat exchange device having a first heat exchanger and a second heat exchanger arranged adjacent to each other so that surfaces of the heat exchangers face each other. A first mounting plate fixed to the side surface of the first heat exchanger, and a second mounting plate fixed to the side surface of the second heat exchanger are fastened and fixed to each other so as to face each other. The first mounting plate has a space of a size such that the second mounting plate can be fixed to the first mounting plate so as to face each other. Insertion holes are formed in the space so as to receive therein tube ends of refrigerant tubes in a plurality of stages, the tube ends laterally projecting from the second mounting plate.