Patent ID: 7651584

Claim:
A processing apparatus including a processing vessel, a mount table arranged in the processing vessel to allow a process object to be placed thereon, and a shower head structure arranged at a ceiling portion of the processing vessel to supply a process gas into an interior of the processing vessel, wherein the shower head structure includes: a shower head main body having a generally cup shape, the shower head main body having a bottom wall provided with a plurality of gas injection holes formed therein and a side wall rising from a peripheral portion of the bottom wall, wherein an upper end of the side wall has steps providing a plurality of projections; a head mounting frame arranged at the ceiling portion of the processing vessel to support the shower head main body, the head mounting frame having a plurality of through-holes into which the projections of the side wall of the shower head main body are respectively inserted, with portions of the side wall other than the projections not being inserted into the through-holes, the through-holes and the projections being configured such that the projections are insertable into the through-holes from a lower side of the head mounting frame, and wherein the head mounting frame is a unitary structure and the shower head main body is attached to the unitary head mounting frame such that the projections of the side wall of the shower head main body is exposed to an exterior of the processing vessel; and at least one diffusion chamber forming plate housed in the shower head main body and defining a gas diffusion chamber which is supplied with the process gas and is communicated with the gas injection holes.