An oxygen absorber of the present invention includes at least one compound represented by Formula (1): ##STR00001## and an oxidizable polymer. R.sup.1 and R.sup.2 each independently indicates a hydrogen atom or an organic group. R.sup.1 and R.sup.2 may form a ring together with carbon atoms to which they are bonded. R.sup.1 and/or R.sup.2 may form a carbon-carbon double bond with carbon atoms to which they are bonded.