The purpose of this invention is to find a novel fragrance component effective for prevention or control of swelling, lymphedema, skin aging or obesity from the viewpoint of activation of lymph vessel function by promotion of the expression of VEGFC. This invention provides a swelling improving agent, lymph vessel activator and VEGFC production promoter characterized by containing one or a plurality of components selected from the group consisting of rose oxide, citronellyl acetate and niaouli oil.