Patent ID: 8671882

Claim:
A plasma processing apparatus comprising: an accommodating compartment that has a processing space therein, accommodates a substrate and performs a plasma treatment on the substrate; a first electrode that mounts the substrate thereon and supplies high-frequency power to the processing space; a second electrode that is disposed such as to face the first electrode and applies a DC voltage to the processing space; an exhaust flow passage that is formed between side walls of the accommodating compartment and first electrode and exhausts gas from the processing space to the outside of the accommodating compartment; and a ground electrode that is disposed in the exhaust flow passage and functions as a ground for the DC voltage applied from the second electrode, wherein the ground electrode is disposed such as to cover a lower portion of the first electrode, a shielding member is provided such as to surround the ground electrode, the ground electrode and the shielding member form therebetween a groove-shaped space, and the groove-shaped space is open toward the upstream of a flow of the gas.