Patent ID: 8038837

Claim:
A plasma processing apparatus comprising: a processing chamber for performing a plasma processing on a substrate; a ring-shaped component including: an inner ring-shaped member provided to surround an outer periphery of the substrate to be subjected to the plasma processing; and an outer ring-shaped member provided to surround an outer periphery of the inner ring-shaped member, wherein the outer ring-shaped member includes: a first surface facing a plasma generation space side where a plasma is generated, the first surface being exposed to the plasma generation space; and a second surface facing an opposite side of the plasma generation space side, the second surface having thereon one or more ring-shaped grooves, each groove defining a thin portion between a deepest portion of each groove and the first surface, the thin portion reducing a heat capacity of the outer ring-shaped member to thereby rapidly increase a temperature rising rate of the outer ring-shaped member by absorbing heat from a plasma when the substrate is subjected to the plasma processing, wherein a plurality of protrusions is formed on the second surface via which the second surface is in point contact with a mounting member mounting thereon the outer ring-shaped member, and wherein a contact area between the second surface and the mounting member is equal to or smaller than 1% of a surface area of the second surface.