Abstract: The present invention relates to a laser processing apparatus for irradiating a printed wiring board 9 with a laser beam L so as to form holes 22 at a plurality of predetermined positions on the printed wiring board 9. The device includes, from upstream on an optical path of the laser beam: a second fly eye lens 6 that achieves the uniform intensity distribution of the laser beam L; a second condenser lens 7 that collimates the laser beam L emitted from the second fly eye lens 6; and a micro lens array 8 positioned in a manner facing the printed wiring board 9 and having a plurality of micro lenses 19 formed in a manner corresponding to the plurality of positions on the printed wiring board 9.