PROBLEM TO BE SOLVED: To produce an exhaust gas purifying catalyst having high catalyst activity and disposable by incineration when it becomes spent, provide its manufacturing method, its disposing method and a method for purifying exhaust gas by using the catalyst. SOLUTION: This exhaust gas purifying catalyst is obtained by applying a catalyst component to rectangular or square polyimide-based combustible felt and depositing it. The catalyst component contains a first component consisting of at least one kind selected from titania, silica, alumina and silica- alumina and a second component consisting of at least one metal oxide selected from vanadium oxide, tungsten oxide and molybdenum oxide. The exhaust gas purifying method comprises contacting the catalyst at 170-190 deg.C with the exhaust gas after dust is removed at 140-200 deg.C to remove harmful component in the exhaust gas. The catalyst disposing method comprises throwing the spent catalyst into an incineration furnace or a melting furnace of the refuse incineration facilities being the exhaust gas emitting source to incinerate or melt it at 1,000-1,300 deg.C.