Heater describe for CVD apparatus

A heater is used in a CVD apparatus. In the CVD apparatus, reactive gas is supplied through a reactive gas supply plate to a substrate on a substrate holder to deposit a film on the substrate, and a purge gas supply passage is formed by placing a shield mechanism around the substrate holder, the shield mechanism including a ring plate disposed close to the outer periphery of the substrate. During film deposition, purge gas supplied through the purge gas supply passage is blown off from a clearance between the substrate and the ring plate, thereby preventing a film from being deposited on the rear surface of the substrate or the like. A heating element is arranged in a space in the purge gas supply passage close to but not contacting the substrate holder. The heating element is preferably a ceramic heater.

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