An object of the invention is to provide a polishing pad that is prevented from slurry leaks and has high optical detection accuracy. The present invention relates to a polishing pad comprising a polishing region, a cushion layer, and a support film layered in this order, wherein a light-transmitting region is provided on the support film and in an opening part that passes through the polishing region and the cushion layer; the light-transmitting region has a peripheral part and a recessed part on the surface of a polishing platen-side; the support film is layered on the peripheral part; and the support film is not layered on the recessed part, which remains open.
1. A polishing pad comprising a polishing region, a cushion layer, and a support film layered in this order, wherein
a light-transmitting region is provided on the support film and in an opening part that passes through the polishing region and the cushion layer;
the light-transmitting region is a window constituted by a light-transmitting resin passing through the polishing region and the cushion layer in the opening part, and has a peripheral part and a recessed part on a surface of a polishing platen-side, wherein a bottom surface of the peripheral part of the light-transmitting resin is flush with a bottom surface of the cushion layer;
the support film is layered on and attached to the bottom surface of the peripheral part and the bottom surface of the cushion layer; and
the support film is not layered on nor attached to a top surface of the recessed part, which remains open.
2. The polishing pad according to claim 1 , wherein a covering member is provided on the side surface of the recessed part.
3. The polishing pad according to claim 2 , wherein the covering member is formed by bending an end part of the support film layered on the peripheral part.
4. A method for producing a semiconductor device, comprising the step of polishing the surface of a semiconductor wafer by using the polishing pad according to claim 1 .
5. A method for producing a semiconductor device, comprising the step of polishing the surface of a semiconductor wafer by using the polishing pad according to claim 2 .
6. A method for producing a semiconductor device, comprising the step of polishing the surface of a semiconductor wafer by using the polishing pad according to claim 3 .