Patent ID: 8192577

Claim:
A focus ring for use in a plasma etching apparatus for performing an etching by using a plasma on a surface of a substrate mounted on a susceptor in an airtight processing vessel, the focus ring being provided to surround a periphery of the substrate, comprising: a lower step portion formed at an inner peripheral side of the focus ring; and an upper step portion surrounding the lower step portion, wherein a top surface of the upper step portion is divided into a first region at an inner side on the top surface of the upper step portion and a second region surrounding the first region, wherein an average surface roughness Ra of the first region is small such that a reaction product produced during an etching processing is not captured to be deposited on a corresponding region and an average surface roughness Ra of the second region is large such that a reaction product is captured to be deposited on a corresponding region and wherein the average surface roughness Ra of the first region is 0.1 um or less.