Patent ID: 7709767

Claim:
A laser processing method including: a first step of irradiating a planar object to be processed with laser light while locating a light-converging point within the object, so as to form a first modified region to become a starting point region for cutting within the object along a first line to cut in the object, and form a second modified region to become a starting point region for cutting within the object along a second line to cut intersecting the first line to cut such that the second modified region intersects at least a part of the first modified region; and a second step of irradiating the object with the laser light while locating the light-converging point within the object after the first step, so as to form a third modified region to become a starting point region for cutting along the first line to cut within the object between the first modified region and an entrance face of the object where the laser light is incident, and form a fourth modified region to become a starting point region for cuffing along the second line to cut within the object between the second modified region and the entrance face such that the fourth modified region intersects at least a part of the third modified region.