Patent ID: 7988814

Claim:
A plasma processing apparatus which processes a substrate to be processed placed on a mounting table disposed in a process chamber, by generating plasma in the process chamber by application of high-frequency voltage, the apparatus comprising: a focus ring disposed to surround a periphery of the substrate to be processed placed on the mounting table, wherein said focus ring includes a ring-shaped first insulating member and a ring-shaped first conductive member disposed on top of the first insulating member, and the first conductive member includes: an outer ring portion disposed on an outer side of the periphery of the substrate to be processed placed on the mounting table; and an inner ring portion disposed under and at a predetermined interval apart from a peripheral edge portion of the substrate to be processed placed on the mounting table, wherein an interval L 1 between an outer circumferential surface of the substrate to be processed placed on the mounting table and an inner circumferential surface of said focus ring which faces the outer circumferential surface of the substrate to be processed is wider than an interval L 2 between an upper surface of the inner ring portion and a lower surface of the peripheral edge portion of the substrate to be processed placed on the mounting table, wherein the inner ring portion and the mounting table are electrically insulated from each other, wherein a second conductive member electrically connected to ground is disposed close to the outer ring portion insulated from the mounting table by the first insulating member, and a second insulating member is interposed between the outer ring portion and the second conductive member, wherein the first insulating member includes a first inner circumferential surface with the same diameter as an inner surface of the inner ring portion, a second inner circumferential surface which abuts the mounting table, a first outer circumferential surface which abuts an inner circumferential surface of the second insulating member and a first inner circumferential surface of the second conductive member, and a second outer circumferential surface which abuts a second inner circumferential surface of the second conductive member, and wherein a diameter of the second inner circumferential surface of the first insulating member is greater than the diameter of the first inner circumferential surface of the first insulating member and a diameter of the second outer circumferential surface of the first insulating member is greater than a diameter of the first outer circumferential surface of the first insulating member.