Patent ID: 8608856

Claim:
A sealing part in a substrate processing apparatus that has a reduced pressure vessel in which is present a high-elasticity polymeric material-eroding eroding substance and carries out predetermined processing on a substrate housed in the reduced pressure vessel, the sealing part sealing an inside of the reduced pressure vessel from an outside, the sealing part comprising: a first member that is disposed on an inside side of the reduced pressure vessel and is resistant to the eroding substance, the first member comprising a substantially U-shaped cross section that opens out on the outside side of the pressure vessel and has at least one narrow portion which bends for promoting compressive deformation thereof; a second member made of the high-elasticity polymeric material that is disposed on an outside side of the reduced pressure vessel; and at least one predetermined space formed between at least part of said first member and at least part of said second member; wherein at least part of said second member enters into an opening of said U-shaped cross section of said first member, wherein said at least one predetermined space is an enclosed space formed by contacting said first member and said second member with each other in at least two portions, the enclosed space being disposed inside said first member, and wherein said at least one predetermined space shrinks when said first member and said second member are compressed.