A method of manufacturing a resistor includes steps of providing a resistance material and two electrode materials, wherein a reflectivity of the resistance material is smaller than a reflectivity of the electrode material; fixing the two electrode materials at opposite sides of the resistance material; and welding two first junctions between the resistance material and the two electrode materials by a first laser from a first side of the resistance material, wherein a beam area from the first laser to the resistance material is larger than a beam area from the first laser to the electrode material.