Patent ID: 7083846

Claim:
A ceramic member being usable in a state where at least a part thereof is exposed in a reactor in which halogen plasma is generated, comprising: a base member containing a first ceramic material as a main component; and a coating layer on a surface of the base member, said surface being adapted to face an inside of a reactor, the coating layer containing a second ceramic material more resistant to plasma etching than the first ceramic material as a main component, wherein the coating layer includes a thick portion in a region where an etching rate of the coating layer by the halogen plasma is locally high, and a thickness (tt) of the thick portion and a thickness (tn) of a normal thickness portion other than the thick portion satisfy the following expression (1): tn<tt ≦( Ee/En )× tn (1) where En: etching rate of the coating layer in the normal thickness portion; and Ee: etching rate of the coating layer in the thick portion.