PROBLEM TO BE SOLVED: To obtain a medicine or a cosmetic that is highly safe and useful for preventing, ameliorating or treating various symptoms caused by estrogen deficiency by promoting estrogen formation in the body. SOLUTION: The subject aromatase activator comprises one or more kinds selected from a plant selected from Iris florentina, Lamium album, Ononis spinosa, Typha angustifolia, Glycyrrhiza glabara, Sophora angustifolia, Citrus paradisi, Cinnamomum cassia, Gentiana lutea, Eugelhardtia chrysolepis, Marsdenia cundurango, Asarum sieboldii, Salvia officinalis, Crataegus cuneata, Dioscorea japonica, Zingiber officinale, Acorus calamus, Betula platyphylla, Lonicera japonica, Crataegus oxyacantha, Achillea millefolum, Morus alba, Thymus serpyllum, Syzygium aromaticum, Citrus unshiu, Citrus aurantium, Astragalus gummifer, Hamamelis virginiana, Angelica dahurica, Ruscus aculeatus, Sinomenium acutum, Imperata cylindrica, Saposhnikovia dibaricata, Humulus lupulus, Ephedra sinica, Lavandura angustifolia, Pyrus malus, Ganoderma lucidum, Lactuca sativa, Citrus limon, Anthemis nobilis and Sanguisorba officinalis, their extracts, yeast essence, silk protein extracts, milk proteins, trehalose, essence of fermented soybeans and royal jelly. COPYRIGHT: (C)2006,JPO&NCIPI