A heat exchanger such as a condenser for use in an automotive air-conditioner includes a core unit having a plurality of laminated tubes and fins. Brackets for mounting the heat exchanger on a vehicle are connected to U-shaped side plate disposed on an outside of the core unit. After components constituting the core unit including the side plate are all connected to one another by brazing, the brackets are connected to the side plate via mounting members made of rubber by staking sidewalls of the U-shaped side plate. Since the brackets are connected to the heat exchanger by staking after the heat exchanger is completed, the heat exchanger is easily brazed and the number and positions of the brackets on the side plate can be arbitrarily selected.