PROBLEM TO BE SOLVED: To provide an external composition for skin having high moisture retention effect by activating skin cells and accelerating hyaluronic acid production.SOLUTION: The invention provides a rice fermented product by lactic acid bacteria obtained by fermenting rice with lactic acid bacteria belonging to Leuconostoc separated from the traditional sake yeast mash starter whose raw material is rice and rice malt, and having a cell-activating action and a hyaluronic acid production-promoting action and a moisturizing agent and an external composition for skin containing the rice fermented product by lactic acid bacteria as an active ingredient.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】皮膚細胞を賦活しヒアルロン酸産生を亢進することにより、より高い保湿効果を有する皮膚外用組成物を提供すること。【解決手段】米と米麹を原料とする生もとから分離したリューコノストック属(Leuconostoc)に属した乳酸菌で米を発酵させた、細胞賦活作用およびヒアルロン酸産生促進作用を有する乳酸菌米発酵物、並びに当該乳酸菌米発酵物を有効成分として含有する保湿剤及び皮膚外用組成物の提供。【選択図】なし