Patent ID: 8852386

Claim:
A plasma processing apparatus comprising: a shower head that is installed within a processing chamber for processing a substrate therein so as to face a mounting table for mounting a substrate thereon and supplies a gas toward the substrate in a shower pattern through a plurality of gas discharge holes provided in a facing surface of the shower head facing the mounting table; a multiple number of gas exhaust holes provided in the facing surface of the shower head; a vertically movable ring-shaped member that is installed along a circumference of the mounting table and is configured to form, at a raised position, a processing space surrounded by the mounting table, the shower head and the ring-shaped member; a multiplicity of gas supply holes opened in an inner wall of the ring-shaped member to supply a gas into the processing space; and a plurality of gas exhaust holes opened in the inner wall of the ring-shaped member to evacuate the processing space, wherein, at the raised position, the inner wall of the ring-shaped member is positioned close to an outer sidewall of the mounting table, such that the processing space is formed only in a region directly above the mounting table, and at least a part of the gas supply holes of the ring-shaped member is formed to have a preset inclination angle with respect to the facing surface, such that the gas is supplied toward the substrate, and wherein the ring-shaped member includes an upper ring-shaped member and a lower ring-shaped member, a ring-shaped gas exhaust path communicating with the plurality of gas exhaust holes is provided within the upper ring-shaped member and a gas exhaust port is provided within the lower ring-shaped member, the gas is exhausted downward through the ring-shaped gas exhaust path and the gas exhaust port, a vertical hole communicating with the multiplicity of gas supply holes is provided within the upper ring-shaped member and a ring-shaped gas flow path communicating with the vertical hole is provided within the lower ring-shaped member, and the ring-shaped gas flow path is connected with a processing gas supply mechanism via at least one processing gas supply port formed through the lower ring-shaped member and the upper ring-shaped member, wherein an outer periphery of the lower ring-shaped member protrudes outward from the upper ring-shaped member, and protruding portions of the lower ring-shaped member are in contact with a flange.