Patent ID: 7974525

Claim:
A heat processing furnace comprising: a processing vessel for accommodating an object to be processed and performing thereto a heat process; and a cylindrical heater disposed to surround a circumference of the processing vessel, for heating the object to be processed, wherein the heater includes: a cylindrical heat insulating member, ribbed shelf sections that are axially formed in a tier-like manner on an inner circumference of the heat insulating member, and heating resistance wires of a helical pattern that are placed along the respective shelf sections; and pin members are arranged in the heat insulating member at suitable intervals there between, the pin members holding the heating resistance wires such that the heating resistance wires are movable in a radial direction of the heater, while preventing dropout of the heating resistance wires from the shelf sections and, wherein each of the shelf sections of the heat insulating member is provided with a forcible-cooling-air blowing hole that passes through the shelf section inside and outside.