To provide a treating apparatus for a hazardous substance such as an organic halogen compound in which filter filtration mechanism can decompose exhaust gas at comparatively low temperature, the exhaust gas being produced when the hazardous substance such as the organic halogen compound is decomposed by microwave irradiation, with the result that durability of a filter part is improved and the risk of resynthesization of dioxins is eliminated.

The treating apparatus for the hazardous substance such as the organic halogen compound is provided with: a cabinet 1 in which a solid with the hazardous substance such as the organic halogen compound stuck thereto or adsorbed thereinto is introduced; a microwave irradiation mechanism 2 which irradiates the solid with the hazardous substance such as the organic halogen compound stuck thereto or adsorbed thereinto that is introduced in the cabinet 1, with a microwave; and the filter filtration mechanism 3 which filters the exhaust gas produced in the cabinet 1. The filter filtration mechanism 3 is provided so that a filter part 31 of the filter filtration mechanism 3 is irradiated with microwave radiated in the cabinet 1, and further a catalyst 32 which is activated by microwave and which decomposes the hazardous substance such as the organic halogen compound is arranged at the filter part 31 of the filter filtration mechanism 3.