A jaw protector opening apparatus, comprising: a release button provided at one side of a jaw protector, which is pivotally provided with respect to a helmet body to protect the jaw of a wearer, the release button being operated to release coupling with the helmet body to allow the jaw protector to be pivotal; and a fixing/releasing unit provided in the jaw protector, the fixing/releasing unit releasing the coupling with the helmet body in association with the release button when the release button is operated, wherein the fixing/releasing unit includes: a fixed plate fixed to an inner side of the jaw protector; a pivoting lever pivotally coupled to one side of the fixed plate so as to be coupled to the helmet body when the release button is released; an elastic body interposed between the pivoting lever and the fixed plate to restore the pivoting lever to an initial location when the pivoting lever is released; and a cable for connecting the release button and the pivoting lever so that the pivoting lever pivots when the release button is pulled; characterized in that the elastic body is a torsion spring for applying an elastic force with respect to a pivoting direction of the pivoting lever, the torsion spring is provided at a hinge protrusion by which the pivoting lever is hinged to the fixed plate, one side of the torsion spring is connected to the pivoting lever so that an elastic force is transferred in the rotating direction of the pivoting lever and the other side of the torsion spring is connected to the fixed plate. a release button provided at one side of a jaw protector, which is pivotally provided with respect to a helmet body to protect the jaw of a wearer, the release button being operated to release coupling with the helmet body to allow the jaw protector to be pivotal; and a fixing/releasing unit provided in the jaw protector, the fixing/releasing unit releasing the coupling with the helmet body in association with the release button when the release button is operated, wherein the fixing/releasing unit includes: a fixed plate fixed to an inner side of the jaw protector; a pivoting lever pivotally coupled to one side of the fixed plate so as to be coupled to the helmet body when the release button is released; an elastic body interposed between the pivoting lever and the fixed plate to restore the pivoting lever to an initial location when the pivoting lever is released; and a cable for connecting the release button and the pivoting lever so that the pivoting lever pivots when the release button is pulled; characterized in that the elastic body is a torsion spring for applying an elastic force with respect to a pivoting direction of the pivoting lever, the torsion spring is provided at a hinge protrusion by which the pivoting lever is hinged to the fixed plate, one side of the torsion spring is connected to the pivoting lever so that an elastic force is transferred in the rotating direction of the pivoting lever and the other side of the torsion spring is connected to the fixed plate. a fixed plate fixed to an inner side of the jaw protector; a pivoting lever pivotally coupled to one side of the fixed plate so as to be coupled to the helmet body when the release button is released; an elastic body interposed between the pivoting lever and the fixed plate to restore the pivoting lever to an initial location when the pivoting lever is released; and a cable for connecting the release button and the pivoting lever so that the pivoting lever pivots when the release button is pulled; characterized in that the elastic body is a torsion spring for applying an elastic force with respect to a pivoting direction of the pivoting lever, the torsion spring is provided at a hinge protrusion by which the pivoting lever is hinged to the fixed plate, one side of the torsion spring is connected to the pivoting lever so that an elastic force is transferred in the rotating direction of the pivoting lever and the other side of the torsion spring is connected to the fixed plate.