Patent ID: 6997993

Claim:
A susceptor supporting construction comprising a susceptor for heating a member to be processed and a supporting member, in which an inner space is arranged, connected to one another, a chamber having an opening connected to the supporting member, the opening of the chamber being in communication with the inner space of the supporting member, and the inner space of the supporting member being sealed in an airtight manner with respect to an inner space of the chamber, said supporting member further comprising a first wall portion defining a tubular main portion, a second wall portion defining a diameter extending portion arranged at an end portion thereof, the entirety of said second wall portion being joined to the susceptor, and one or more continuous round portions arranged between the main portion and the diameter extending portion, when viewed by an outer profile of a longitudinal section of the supporting member, wherein a portion of an outer surface of said second wall portion is substantially parallel to a portion of an outer surface of said first wall portion, the radial thickness of said first wall portion is less than the radial thickness of said second wall portion, and an inner surface of the supporting member has a substantially constant diameter along the entire length of the supporting member and wherein said first wall portion, said second wall portion and said one or more continuous round portions define a one-piece structure.