PURPOSE: To provide a catalyst for removing nitrogen oxide enhanced in initial activity and reduced in the lowering of activity even when used for a long period of time.

CONSTITUTION: A catalyst for removing nitrogen oxide catalystically reducing and removing nitrogen oxide in exhaust gas using NH3 is obtained by preliminarily making a vanadium compd. and a molybdenum compd. and/or a tungsten compd. adsorbed and supported on rutile type titanium oxide and subsequently mixing anatase type titanium oxide in a wt. ration of 99/1-50/50 to interpose the same between rutile type titanium oxide particles. Therefore, the catalyst excellent in initial activity is obtained and, since the lowering of activity caused by the conversion of titanium oxide being a catalyst carrier into rutile type titanium oxide with the elapse of use time is prevented, heat resistance is high and high activity can be kept for a long time.