To provide a dry distillation furnace which achieves the increase of a processing amount by continuous processing of a processed product and inhibits the degradation of a dry distillation product material.

A dry distillation furnace includes: a supply part 12 which may continuously supply a processed product S; a reaction part 13 which is disposed below the supply part 12 and performs dry distillation for the processed product S supplied from the supply part 12; and a heating part 20 which is disposed below the reaction part 13 and heats the processed object. The heating part 20 includes: a cylindrical heating cylinder 21 in which the processed product passes at the inner side; a combustion gas flow passage 25 enclosing an outer periphery of the heating cylinder 21; and a burner 27 which sends a combustion gas H to the combustion gas flow passage 25.