Patent ID: 8038836

Claim:
A plasma processing apparatus that executes a specific type of processing on a processing target substrate with radicals generated by raising a processing gas to plasma, comprising: a plasma generation chamber where plasma is generated by exciting the processing gas; a processing chamber disposed continuously to said plasma generation chamber; a stage disposed inside said processing chamber, upon which the processing target substrate is placed; and a barrier wall member separating said plasma generation chamber from said processing chamber, wherein: said barrier wall member is formed by disposing at a peripheral edge area thereof numerous plate-like fin members in a radial pattern so as to extend from a central area of said barrier wall member toward the peripheral edge area; said fin members are positioned so that an upper end portion of each fin member overlaps a lower end portion of an adjacent fin member, said fin members each range upward with a tilt along the circumferential direction with a gap formed between each fin member and an adjacent fin member, and said fin members are supported by an upper support member and a lower support member so that central side ends and peripheral side ends of said fin members are held between said upper support members and said lower support members; and as said upper support member and said lower support member are offset relative to each other by turning said upper support member and said lower support member relative to each other, the tilt angles of said fin members adjust together.