there are described an anode , a process for producing the same , an apparatus for electrolytic chromium plating , and a method for electrolytic chromium plating , using such anode , wherein the anode comprises an electrically conductive substrate comprising a valve metal or an alloy thereof , a first intermediate layer formed on the sustrate and comprising an oxide of tin , a second intermediate layer formed on the first intermediate layer and comprising either platinum metal and an oxide of tin , or platinum metal , an oxide of tin , and iridium oxide , and a surface layer formed on the second intermediate layer and comprising either platinum metal and an oxide of tin , or platinum metal , an oxide of tin , and iridium oxide , the composition of said surface layer being different form that of said second intermediate layer .