OXYGEN REDUCTION CATALYST, PROCESS FOR PRODUCING SAME, AND POLYMER ELECTROLYTE MEMBRANE FUEL CELL

It is an object of the present invention to provide an oxygen reducing catalyst having high catalytic activity and high durability using a transition metal (such as titanium); and a method for producing a fuel cell electrode catalyst using the oxygen reducing catalyst. The present invention provides the oxygen reduction catalyst including titanium, carbon, nitrogen, and oxygen as constituent elements at a specific ratio, wherein in XRD measurement using a Cu-K± ray, peaks are each present in at least regions A and B among regions A to D which occupy 2¸ ranges of 42° to 43°, B: 36.5° to 37°, 25° to 26°, and 27° to 28°, respectively; and each of maximum peak intensities I A , I B , I C , and I D in the regions A to D satisfies both relationships of I A >I B and 0.3‰¤ (I A /(I A +I C +I D )) ‰¤1.