Abstract: An incinerator for combustion of general refuse and industrial wastes having a pair of ash discharge plates and a pair of refuse supporting plates. The ash discharge plates are disposed at the bottom of a furnace in such a manner that it can be freely opened and closed for timely discharge of ashes that accumulate on the bottom. The refuse supporting plates are disposed at a lower level of the furnace in such a manner that it can be freely displaced in a horizontal direction out of and into the furnace projecting into an upper layer of the piled up ashes at the time of discharge of ashes by the ash discharge plates to support the refuse and ashes disposed thereabove.