Disclosed are: a highly safe lactic acid bacterium which is effective for prophylaxis and treatment of allergies and/or lowering of blood triglyceride levels and a lactic acid bacterium preparation. Specifically, a composition containing cells of a lactic acid bacterium obtained by culturing Pediococccus acidilactici R037 strain or a processed product thereof is added, as an active ingredient, to a pharmaceutical product, food or drink.
