<;P>;PROBLEM TO BE SOLVED: To provide a new gene expression promoting agent for skin beautifying use, effective for promoting the expression of a skin-beautifying gene such as aquaporin 3, aquaporin 5, serine palmitoyl transferase enzyme and hyaluronic acid synthase. <;P>;SOLUTION: The gene expression promoting agent for skin beautifying use contains an extract of a plant of the genus Fragaria L., family Rosaceae as an active component. The extract preferably contains tiliroside. The part of the plant of the genus Fragaria L., family Rosaceae to be used in the agent is preferably seed. The invention is widely usable for foods, drinks, pharmaceuticals, skin care preparations, etc. <;P>;COPYRIGHT: (C)2010,JPO&INPIT