Disclosed is a lactic acid bacterium proliferation promoter which does not cause the deterioration in flavor of a food. The lactic acid bacterium proliferation promoter comprises a fruit of a plant belonging to the genus Ananas or an extract from the fruit as an active ingredient.本發明提供一種不損害食品風味之乳酸菌增殖促進劑。該乳酸菌增殖促進劑係以鳳梨屬植物之果實或其萃取物作為有效成分。