Patent ID: 8687343

Claim:
A substrate mounting table of a substrate processing apparatus comprising: a base portion; a circular plate-shaped electrostatic chuck adhered to an upper surface of the base portion by an adhesive layer, the electrostatic chuck having a circular attracting surface to support a substrate; and an annular focus ring arranged around the electrostatic chuck to surround the substrate and to cover an outer peripheral portion of the upper surface of the base portion, wherein the electrostatic chuck has a two-layer structure including an upper circular part and a lower circular part having a diameter larger than that of the upper circular part, wherein the base portion has a depression in which the lower circular part of the electrostatic chuck is disposed, and wherein a gap is located between a side surface of the lower circular part disposed in the depression and an inner wall surface of the depression, and wherein the gap and an outer peripheral portion of the adhesive layer adhering the lower circular part to the base portion are hidden under the focus ring when viewing the electrostatic chuck from a substrate side.