Abstract: The present invention relates to an incinerator devised to incinerate various kinds of wastes including medical and food wastes. Up to this time, the waste containing an explosive chemical substance like alcohol or the waste containing water in large quantities has been disposed of unsanitarily, requiring a great deal of labor and cost. The present invention is equipped with a primary combustion chamber, a secondary combustion chamber, a communicating means which introudces gases to the secondary combustion chamber from the primary combustion chamber, an exhaust means which discharges waste gas from the secondary combustion chamber and a microwave generation means. It is an incinerator aimed to solve the above problem by a method wherein waste is incinerated after it is desiccated and pyrolyzed by applying microwaves thereto and explosive gas is disposed of. It is an sanitary incinerator which contains no bad smell, no harmful substance and no smoke in the exhaust gas discharged after incineration.