Provided is a hair restoration/growth stimulating agent containing at least one type of flavonoid represented by formula (I) as an active ingredient. Further provided is a hair restoration/growth stimulating agent containing at least one type of phenylpropanoid represented by formula (II) as an active ingredient.本發明提供一種含有式(I)所表示之一種或複數種類黃酮類作為有效成分之育髮/生髮促進劑。又,本發明提供一種含有式(II)所表示之一種或複數種苯基丙烷類作為有效成分之育髮/生髮促進劑。