Disclosed is a lactic acid bacterium useful for the amelioration of lactose intolerance. More specifically, disclosed are: a method for screening a lactic acid bacterium capable of ameliorating lactose intolerance, characterized by selecting a bacterium having an enhanced enteroadherence property and an enhanced lactose-degrading enzyme activity from lactic acid bacteria belonging to the genus Lactobacillus; and a lactic acid bacterium provided by the method.