To provide a DNA damage repair promoter for oral application and an elastase activity suppressor for oral application. The invention provides a DNA damage repair promoter and an elastase activity suppressor for oral application each containing, as an active ingredient, a bacterium belonging to the genus bifidobacterium.本發明提供一種經口用DNA損傷修復促進劑及經口用彈性蛋白酶活性抑制劑。本發明之經口用DNA損傷修復促進劑及經口用彈性蛋白酶活性抑制劑含有雙叉桿菌屬細菌作為有效成分。