Patent ID: 7701693

Claim:
An electrostatic chuck, comprising: a plate-like base that is made of ceramics and has a substrate mounting surface on which a substrate is to be mounted; and a dielectric electrode embedded in the base, wherein the base includes a support portion made of alumina ceramics, and a surface and side portions that are made of yttria ceramics and form at least the substrate mounting surface of the base on a surface of the base and side surfaces of the base, wherein a carbon content in alumina ceramics in a vicinity of the dielectric electrode is 0.03 wt % or less, and wherein a thickness of a portion of the base, which forms the substrate mounting surface, is 0.2 mm to 0.5 mm, and a thickness of a portion of the base, which forms the side surface of the base, is 0.2 mm to 10 mm.