A method for producing glycine in which an aqueous solution of glycinonitrile is subjected to a hydrolysis reaction in a hydrolysis reaction system in which the oxygen dissolved therein is maintained in an amount of 5 ppm by weight or less, under the action of a microbial enzyme having the activity to hydrolyze a nitrile group. The glycinonitrile is converted to glycine with by-production of ammonia. The hydrolysis of glycinonitrile is conducted either in the presence of the ammonia or while recovering the by-produced ammonia separately from the recovery of glycine in the absence of a base and an acid.