Patent ID: 8920596

Claim:
A plasma processing apparatus which processes a substrate by plasmatizing a process gas introduced into a processing container comprising: a dielectric window disposed at a ceiling of the processing container; an introducing unit disposed in the dielectric window, the introducing unit having a gas supply passage; an opening formed at an end of the gas supply passage; an injector block disposed under the opening with a gap between the opening and the injector block, the gap forming a gas retention portion retaining the process gas introduced through the opening, wherein the opening is positioned above the center of the injector block; a plurality of gas ejection holes formed in the injector block except for a region directly under the opening; a recess formed in the region of the injector block directly under the opening to buffer the process gas exiting from the opening; and a gas passageway formed by the dielectric window under the injector block, the gas passageway having a diameter configured to become gradually smaller towards inside the processing container so that the gas ejection holes are covered by the dielectric window and therefore, the gas election holes do not directly face the substrate when viewed vertically upward from inside the processing container, wherein the process gas retained in the gas retention portion flows through the gas ejection holes and then the gas passageway to inside the processing container.