Patent ID: 7722437

Claim:
A manufacturing method of a semiconductor integrated circuit device, comprising the steps of: (a) forming a first member layer over a first main surface of a wafer; and (b) applying chemical mechanical polishing to the first member layer in a chemical mechanical polishing machine, wherein the step (b) comprises the substeps of (i) pressing a rotating dresser to a polishing pad, thereby carrying out dressing treatment; (ii) supplying a polishing slurry to the polishing pad while moving the pad and the wafer relatively in a state that the first main surface of the wafer is pressed to the polishing pad; and (iii) measuring the position of the dresser in the direction perpendicular to a surface of the polishing pad in the substep (i), thereby detecting an abrasion amount and the thickness of the polishing pad indirectly, and wherein the perpendicular position is measured through a displacement sensor comprising a sensor body having a coil section and a displacement body.