Patent ID: 7955991

Claim:
A producing method of a semiconductor device, comprising: loading a substrate into a reaction furnace; forming a film on the substrate in the reaction furnace; unloading the substrate from the reaction furnace after the film has been formed; and purging an interior of the reaction furnace by flowing purge gas in the interior of the reaction furnace simultaneously with forcibly cooling the interior of the reaction furnace by flowing a cooling medium in a space between a thermal insulation cover provided covering the reaction furnace and the reaction furnace, after the substrate has been unloaded from the reaction furnace and in a state where the substrate does not exist in the reaction furnace, wherein the purging of the interior of the reaction furnace includes exhausting atmospheric gas of high temperature in the space between the thermal insulating cover and the reaction furnace simultaneously with flowing the cooling medium in the space between the thermal insulating cover and the reaction furnace.