Patent ID: 7501300

Claim:
A manufacturing method of a semiconductor integrated circuit device, comprising the steps of: (a) forming a circuit pattern over a first main surface of a semiconductor wafer which has a first thickness; (b) making the semiconductor wafer a second thickness, grinding a second main surface of the semiconductor wafer using a first abrasive which has fixed abrasive; (c) making the semiconductor wafer a third thickness, and forming a crushing layer in the second main surface of the semiconductor wafer, grinding the second main surface of the semiconductor wafer using a second abrasive which has a fixed abrasive whose particle diameter is smaller than the first abrasive; and (d) individually separating the semiconductor wafer into a chip, performing dicing of the semiconductor wafer; wherein the second abrasive is a grinding wheel which held fixed abrasive with a binder which has countless bubbles, and which includes porcelain nature, and impregnates a synthetic resin in the countless bubbles, and wherein the porcelain nature is a material which has feldspar as a main component.