A heat exchange device for a vehicle, the heat exchange device comprising: a water-cooled engine structured to be cooled by first cooling water; a two-stage type water-cooled intercooler that is structured to cool supercharge intake air supplied to the water-cooled engine, and includes a first core structured to perform cooling with the first cooling water and a second core structured to perform cooling with second cooling water, wherein the first core is disposed upstream on an intake path with respect to the second core; a water-cooled condenser structured to cool coolant for an air conditioner with use of the second cooling water that is introduced parallelly into the water-cooled condenser and the second core of the two-stage type water-cooled intercooler; a first radiator disposed at a position to receive wind due to vehicle traveling, and structured to cool the first cooling water by heat exchange with air; a second radiator disposed in front of the first radiator so as to overlap with a part of the first radiator, and structured to cool the second cooling water by heat exchange with air; and an air-cooled condenser disposed in front of the first radiator adjacently to the second radiator so as to overlap with a part of the first radiator, and arranged in series with the water-cooled condenser in a coolant circuit for the air conditioner, and structured to cool the coolant by heat exchange with air, wherein: the vehicle is a series hybrid vehicle structured to generate electric power with a generator driven by the water-cooled engine and travel by driving a motor with the generated electric power; and the second core and the water-cooled condenser are arranged in parallel with a drive system electrical component cooling water circuit that is structured to cool a drive system electrical component with use of the second cooling water. a water-cooled engine structured to be cooled by first cooling water; a two-stage type water-cooled intercooler that is structured to cool supercharge intake air supplied to the water-cooled engine, and includes a first core structured to perform cooling with the first cooling water and a second core structured to perform cooling with second cooling water, wherein the first core is disposed upstream on an intake path with respect to the second core; a water-cooled condenser structured to cool coolant for an air conditioner with use of the second cooling water that is introduced parallelly into the water-cooled condenser and the second core of the two-stage type water-cooled intercooler; a first radiator disposed at a position to receive wind due to vehicle traveling, and structured to cool the first cooling water by heat exchange with air; a second radiator disposed in front of the first radiator so as to overlap with a part of the first radiator, and structured to cool the second cooling water by heat exchange with air; and an air-cooled condenser disposed in front of the first radiator adjacently to the second radiator so as to overlap with a part of the first radiator, and arranged in series with the water-cooled condenser in a coolant circuit for the air conditioner, and structured to cool the coolant by heat exchange with air, wherein: the vehicle is a series hybrid vehicle structured to generate electric power with a generator driven by the water-cooled engine and travel by driving a motor with the generated electric power; and the second core and the water-cooled condenser are arranged in parallel with a drive system electrical component cooling water circuit that is structured to cool a drive system electrical component with use of the second cooling water. the vehicle is a series hybrid vehicle structured to generate electric power with a generator driven by the water-cooled engine and travel by driving a motor with the generated electric power; and the second core and the water-cooled condenser are arranged in parallel with a drive system electrical component cooling water circuit that is structured to cool a drive system electrical component with use of the second cooling water.