Patent ID: 8828891

Claim:
A laser processing method of irradiating a planar object to be processed with laser light so as to form a modified region to become a starting point region for cutting in the object along a line to cut the object; wherein, when relatively moving a converging point of the laser light along the line while using one main face of the object as a laser light entrance surface, so as to form modified regions at a position closer to the other main face of the object, a position closer to the one main face, and an intermediate position between the position closer to the other main face and the position closer to the one main face, for forming the modified region at the intermediate position after forming the modified region at the position closer to the other main face but before forming the modified region at the position closer to the one main face, the laser light is modulated by a spatial light modulator according to a modulation pattern including a quality pattern having a first brightness region extending in a direction intersecting the line and second brightness regions adjacent to both sides of the first brightness region in an extending direction of the line.