PROBLEM TO BE SOLVED: To overcome the problem that low concentration harmful component, odor or the like and decomposition product thereof are contaminated to an exhaust gas from an exhaust part when a large amount of gas having the harmful component, the odor or the like flows into a deodorization catalyst part.SOLUTION: A deodorization device has a gas inflow part 2, a deodorization catalyst part 3 connected to a downstream side of the gas inflow part 2 and having at least a catalyst 4, an adsorption part 5 connected to a downstream side of the deodorization catalyst part 3 and a changeover valve 8 connected to a downstream side of the adsorption part 5, and the changeover valve 8 and the gas inflow part 2 or the deodorization part 3 are connected by a passage part 9.SELECTED DRAWING: Figure 2【課題】有害成分、悪臭等を有するガスが脱臭触媒部へ多量に流入した場合、低濃度の有害成分、悪臭等およびその分解物が、排気部からの排気に混入する場合がある。【解決手段】ガス流入部２と、ガス流入部２の下流側に接続され、少なくとも触媒４を有する脱臭触媒部３と、脱臭触媒部３の下流側に接続された吸着部５と、吸着部５の下流側に接続された切替弁８とを備え、切替弁８とガス流入部２または脱臭触媒部３との間を通路部９で接続する。【選択図】図２
