PROBLEM TO BE SOLVED: To provide an amorphous alloy excellent in corrosion resistance (particularly pitting corrosion resistance).SOLUTION: The amorphous alloy has a composition containing: Cu Ni Al Nb &ge50 atom% Zr Au or Ag and unavoidable impurities wherein the molar ratios x and y of Au and Ag, respectively, in the entire composition satisfy the relations of 0.4%&lex&le0.7% and 0%