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 IA, IB, IC, and ID in the regions A to D satisfies both relationships of IA>IB and 0.3???(IA/(IA+IC+ID))???1.