Patent ID: 7455734

Claim:
A substrate processing apparatus, comprising: a substrate holder capable of holding plural substrates; a processing chamber which houses the substrates held by the substrate holder; and a heater which heats the processing chamber; wherein the substrate holder includes: at least three support columns provided substantially vertically; plural substrate mounting portions which mount the plural substrates substantially horizontally at a predetermined interval, the substrate mounting portions being provided at multi-stages on the support columns so as to protrude from the support columns; plural ring-like plates which surround the at least three support columns, are provided at multi-stages on the support columns, and are provided substantially horizontally at a predetermined interval with respect to the substrates supported on the substrate mounting portions; and notches which are formed by notching inner circumferential surfaces of the ring-like plates, the inner circumferential surfaces being opposite to the support columns, on a periphery of the support columns, the support columns being fitted into the notches and being disposed inside an outer periphery of the ring-like plates.