To reduce the generating amount of carbon monoxide in a briquet range for curing.

A pan receiving body 30 is provided near a bottom part in an outside vessel body 20, formed so as to have a bottomed cylindrical shape, while a primary air intake chamber 31 is formed at the side of the bottom part of the vessel body 20. A combustion cylinder 40, constituted of a cylindrical body 41, whose upper and lower ends are opened, is put on the pan receiving body 30 and is fixed thereto. An upper lid member 60, provided with a discharging port 62 provided at the central part, is put on the upper end opening of the combustion cylinder 40 and a secondary combustion chamber 63 is formed at the upper opening of the combustion cylinder while the chamber 63 is constituted so as to take secondary air thereinto. A horizontal supporting body 70, constituted of an annular plate body 71 and an upper positional side briquet is put thereon, is provided detachably at the intermediate part in the cylindrical body 41 and briquet receiving chambers 43A, 43B, receiving respective one piece of briquet in the lower half and upper half of the cylindrical body 41 while forming a space between the lower side briquet and the upper side briquet, are constituted utilizing the supporting body 70 as a boundary.