Provided is a calcination device wherein uneven calcination can be suppressed, and the productivity can be improved. The calcination device is comprised of a furnace body (13) having an inside space in which a powdery or particulate object (11) to be treated is burned; a gas jetting portion (21) having an opening above the object (11) to be treated that is transferred in the inside space of the furnace body (13), through which an atmosphere gas is jetted; a gas supply portion (18) which supplies the atmosphere gas from a side wall (13c) of the furnace body (13) to the gas jetting portion (21); and heating portions (24a, 24b) which control the distribution of temperature in the inside space of the furnace body (13).