The heat exchanger

The present invention provides a heat exchanger, wherein a plurality of U-shaped heat-exchange tubes (2) are arranged along the tube thickness direction, the U-shaped heat-exchange tube has a pair of flat straight tube parts (21) in parallel in the width direction and a bending part (22) for communicating the pair of the straight tube parts (21). In the heat exchanger, the heat-exchange tube (2) is formed by bending two ends of a band-shaped flat tube component (20) angularly in an intermediate part which is used as the bending part (22), and the two ends of the flat tube component (20) is used as a pair of straight tube part (21). According to the heat exchanger of the invention, it is capable of reducing the component number and lightweighting.