To provide a laser machining apparatus including a dust discharging unit that prevents the dust generated in abrasion processing from obstructing an optical path of a laser beam.

In the laser machining apparatus, the dust discharging unit includes: a casing including a top wall, a bottom wall and a lateral wall for connecting the top wall with the bottom wall to define a dust collecting chamber thereinside and coupled to a condenser; a first opening for allowing a laser beam generated in the top wall to pass therethrough; a second opening for allowing a laser beam generated in the bottom wall to pass therethrough; a suction/discharge port formed in the lateral wall; a V-shaped partition wall inserted into the casing so as to come into contact with the top wall and the bottom wall and dividing the second opening into a center opening, and first and second suction ports located both sides of the center opening; a first flow path defined by the casing and the V-shaped partition wall to connect the first suction port to the suction/discharge port; and a second flow path defined by the casing and the V-shaped partition wall to connect the second suction port to the suction/discharge port.