Patent ID: 7232502

Claim:
A single wafer processing unit comprising: a processing container that can be vacuumed, a stage arranged in the processing container, on which an object to be processed can be placed, a discharging pipe connected to a bottom part of the processing container and extending substantially downward linearly, a stage-supporting pillar arranged to extend in a substantially central portion of the discharging pipe and in a direction of the discharging pipe, the stage-supporting pillar supporting the stage, and a line-taking-off pipe extending through a side wall of the discharging pipe and connected to a lower-end part of the stage-supporting pillar, wherein an inside of the line-taking-off pipe is communicated with an inside of the stage-supporting pillar and wherein the inside of the line-taking-off pipe and the inside of the stage-supporting pillar communicate with the outside atmosphere to be under atmospheric pressure.