Patent ID: 7780440

Claim:
A substrate supporting/transferring tray on which a semiconductor substrate may be placed and which tray is adapted to be placed on a substrate supporting member arranged in a treatment chamber in which the heat treatment occurs for the substrate, the substrate supporting/transferring tray comprising: a substrate supporting portion formed in a disc-shape on an upper side of the substrate supporting/transferring tray; a lateral wall portion extending downwardly from a peripheral edge of the disc-shape substrate supporting portion; and a cap disposed on the substrate supporting portion for sealing the space in which the substrate may be placed on the upper side of the substrate supporting portion, said cap having a hooking step on its bottom end side for engaging an outer periphery on an upper end of the substrate supporting portion and having an inner diameter of its lateral wall located on the hooking step being larger than an outer diameter on the upper end of the substrate supporting portion by at least a positive tolerance.