Provided is a coupling structure of a visor hinge for a headband to connect a protective mask, which is configured to cover the wearer's face along with a viewing window, to both sides of a headband which assists the wearer in wearing the protective mask. The coupling structure includes base molds protruding from both sides of the headband, a slider located outward of each of the base molds, a button located outward of the slider, a stopper located outward of the button, and a hinge located outward of the stopper. Accordingly, it may be possible to easily adjust an angle and a distance of the protective mask with respect to the headband using the hinge, and the welding mask may be used more conveniently.