PROBLEM TO BE SOLVED: To provide an estrogen receptor β activator that selectively activates estrogen receptor β.SOLUTION: The present invention provides an estrogen receptor β activator comprising 3,9-dihydroxypterocarpan as an active ingredient.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】エストロゲン受容体βを選択的に活性化する、エストロゲン受容体β活性化剤の提供。【解決手段】3,9-ジヒドロキプテロカルパンを有効成分とするエストロゲン受容体β活性化剤。【選択図】なし