Patent ID: 7838396

Claim:
A manufacturing method of semiconductor chips, comprising: forming a bonding layer for bonding a substrate face of a semiconductor substrate and a joining face of a sheet to each other, at plural positions partially between the substrate face and the joining face of the sheet; moving a laser head that projects laser light along the predetermined dividing lines for dividing the semiconductor substrate, and applying the laser light from a side of the semiconductor substrate so that a light-converging point is positioned within the semiconductor substrate to form a modified region due to multiphoton absorption at the light-converging point; and expanding the sheet and thereby dividing the semiconductor substrate along predetermined dividing lines with the modified region taken as a starting point to form semiconductor chips, wherein at least one of the forming, the moving and the applying is performed such that the modified region is formed except for any of the predetermined dividing lines, and wherein the semiconductor substrate is not irradiated with the laser light in areas where the bonding layer is formed on the predetermined dividing lines.