The hair fostering medicine where the hair fostering hair growing effect is higher is offered. Formula (1)So 3 where it is displayed - phospho adenosine 5 the hair fostering agent composition which contains - phospho sulfuric acid or that salt.より育毛養毛効果の高い育毛剤を提供する。式(1)で表される3’-ホスホアデノシン5’-ホスホ硫酸又はその塩を含有する育毛剤組成物。