A laser machining head comprising: a collimation lens for making a laser beam parallel; a focusing lens for condensing the paralleled laser beam; and a nozzle unit through which the condensed laser beam is transmitted, the nozzle unit including: a protective member for transmitting the laser beam; an inner nozzle through which the laser beam transmitted through the protective member passes; an outer nozzle disposed outside the inner nozzle; a nozzle holding section for holding the inner nozzle and the outer nozzle; and an orifice, having a ring shape, in contact with the inner nozzle and interposed between the nozzle holding section and the outer nozzle, wherein the nozzle holding section has a space constituting a first gas path connecting an air supply port disposed in the nozzle holding section to the orifice, a space constituting a second gas path is disposed between the inner nozzle and the outer nozzle, an opening connected to the second gas path is disposed in a vicinity of a tip of the nozzle unit, the orifice having the ring shape has a bottom face and a side face with an outer circumferential surface characterized in that a plurality of through-holes are disposed in the outer circumferential surface of the orifice at regular intervals, each of the plurality of through-holes constituting respective one of a plurality of third gas paths connecting the first gas path to the second gas path, and each of the third gas paths has an L-shape connecting the circumferential surface of the orifice to the second gas path through respective one of inner circumferential grooves provided in the bottom face of the orifice. a collimation lens for making a laser beam parallel; a focusing lens for condensing the paralleled laser beam; and a nozzle unit through which the condensed laser beam is transmitted, the nozzle unit including: a protective member for transmitting the laser beam; an inner nozzle through which the laser beam transmitted through the protective member passes; an outer nozzle disposed outside the inner nozzle; a nozzle holding section for holding the inner nozzle and the outer nozzle; and an orifice, having a ring shape, in contact with the inner nozzle and interposed between the nozzle holding section and the outer nozzle, a protective member for transmitting the laser beam; an inner nozzle through which the laser beam transmitted through the protective member passes; an outer nozzle disposed outside the inner nozzle; a nozzle holding section for holding the inner nozzle and the outer nozzle; and an orifice, having a ring shape, in contact with the inner nozzle and interposed between the nozzle holding section and the outer nozzle, wherein the nozzle holding section has a space constituting a first gas path connecting an air supply port disposed in the nozzle holding section to the orifice, a space constituting a second gas path is disposed between the inner nozzle and the outer nozzle, an opening connected to the second gas path is disposed in a vicinity of a tip of the nozzle unit, the orifice having the ring shape has a bottom face and a side face with an outer circumferential surface characterized in that a plurality of through-holes are disposed in the outer circumferential surface of the orifice at regular intervals, each of the plurality of through-holes constituting respective one of a plurality of third gas paths connecting the first gas path to the second gas path, and each of the third gas paths has an L-shape connecting the circumferential surface of the orifice to the second gas path through respective one of inner circumferential grooves provided in the bottom face of the orifice.