Disclosed herein is a heat exchanger, and more particularly, a heat exchanger of an aluminum alloy material designed to have an electric potential difference between a tube of the heat exchanger and a heat exchanger fin. A heat exchanger according to one aspect of the present disclosure includes a tube through which a refrigerant flows, a heat exchanger fin coupled to a surface of the tube, and a filler that couples the tube and the heat exchanger fin, wherein the tube is formed of an aluminum alloy material that includes a rare-earth metal, and the heat exchanger fin and the filler may be formed of aluminum alloy materials that include silicon (Si), copper (Cu), and zinc (Zn).