the ignition burner 41 conversion reaction of the waste resin 4 which is a starting material finally to a combustion gas in the cylindrical body 25 can continuously occur by continuously feeding the waste resin 4 namely the burner apparatus 1 can continuously be operated having described our invention as related to the embodiment shown in the accompanying drawings the scope of the invention should not be limited by the embodiment and various changes and modifications may be made in the invention without departing from the spirit and scope although the cylindrical body 25 of the embodiment is annular in cross section the cylindrical body according to the invention is not limited to such a configuration the cylindrical body according to the invention may take an inner surface of any polygonal configuration such as an octagonal configuration as shown in fig4 if the cylindrical body according to the invention has an inner surface of a polygonal configuration the waste resin is lifted on the inner surface upwardly to a position and drops downwardly by gravity action when the cylindrical body rotates accordingly agitation of the waste resin is accelerated the cylindrical body according to the invention may take an outer surface of any polygonal configuration provided that it is rotatable the cylindrical body according to the invention may be made of metals other than cast steel the cylindrical body 25 of the embodiment is rotated upon rotation of the rollers 9 and 10 that is to say the rollers 9 and 10 serve as a rotating member for rotating the cylindrical body 25 however the rotating member for rotating the cylindrical.