A pentosidine production inhibitor including a lactic acid bacterium fermentation product as an active ingredient, which has a stronger action and a high safety as a component having an action of inhibiting production of pentosidine.作為具有抑制戊糖素生成之作用的成分,具有更強作用、安全性高之以乳酸菌發酵物為有效成分戊糖素生成抑制劑。