[Problem] To provide a waste material treatment apparatus that renders waste materials harmless and reduces the volume thereof while restraining generation of dioxins as much as possible, and that at the same time enables recycling of plastics. [Solution] In order to solve the above problems, provided is a waste material treatment apparatus which: supplies a reactant to facilitate a prompt reaction between an oxidation agent or a neutralizing agent and gases that contain chlorine, hydrocarbons, etc., and that are emitted from non-plastic garbage present in waste materials when heated instantaneously； renders the non-plastic garbage harmless and reduced in volume without generating dioxins or carbon dioxide by repeating the instantaneous heating； and renders plastics harmless and cleaned, thereby enabling recycling thereof.
