To dispense with a human monitor in the case of backing with excellent salability of a pottery kiln and safety of an operation by ensuring sufficient volume for entering and outgoing a work in the kiln and dealing with porcelain from a pottery.

A first exhaust hole 19 is opened at an upper wall of a kiln body 1 in which a flame port 40 is opened at a lower wall, a second exhaust port 20 is opened at the lower wall. A damper for switching the hole 20 is formed at a side stack formed at an outside of the hole 20. A forward submerged swinging door is mounted in a forward opening of the body 1. A gas burner 42 is fixed to an upper end of an elevator under the port 40. A controller 14 for automatically controlling a temperature is provided at the inner wall of the body 1. Upper and lower side heaters 13 for heating upper and lower halves in the kiln are disposed in the kiln.