Patent ID: 8069704

Claim:
A sealing structure of a plasma processing apparatus, which seals an opening of a plasma generation chamber in which a plasma process is performed, the sealing structure comprising: a body for covering the opening of the plasma generation chamber; a ring-shaped first sealing member disposed between the body and a wall of the plasma generation chamber, the first sealing member being exposed to inside of the plasma generation chamber; a ring-shaped second sealing member disposed between the body and the wall of the plasma generation chamber and outer to a ring shape of the first sealing member to provide a gap between the first sealing member and the second sealing member, the second sealing member being not exposed to the inside of the plasma generation chamber; a gas inlet for injecting an inert gas into the gap; and one or more grooves formed in the body or in the wall of the plasma generation chamber in a direction substantially perpendicular to the length direction of the first sealing member in such a manner that the inert gas injected into the gap flows through the grooves into the inside of the plasma generation chamber.