The controllability of modified spots is improved. A laser processing apparatus 100 comprises a first laser light source 101 for emitting a first pulsed laser light L1, a second laser light source 102 for emitting a second pulsed laser light L2, half-wave plates 104, 105 for respectively changing directions of polarization of the pulsed laser light L1, L2, polarization beam splitters 106, 107 for respectively polarization-separating the pulsed laser light L1, L2 having changed the directions of polarization, and a condenser lens 112 for converging the polarization-separated pulsed laser light L1, L2 at an object to be processed 1. When the directions of polarization of the pulsed laser light L1, L2 changed by the half-wave plates 104, 105 are varied by a light intensity controller 121 in the laser processing apparatus 100, the ratios of the pulsed laser light L1, L2 polarization-separated by the polarization beam splitters 106, 107 are altered, whereby the respective intensities of the pulsed laser light L1, L2 are adjusted.