PROBLEM TO BE SOLVED: To provide an immune cell proliferation promoter, an immunostimulator, and food and drink comprising, as an active ingredient, natural product-derived components that have been eaten for a long time and are therefore confirmed to be safe based on experience.SOLUTION: The present invention relates to an immune cell proliferation promoter or an immunostimulator comprising at least one compound selected from compounds represented by the formula (I) and the like as an active ingredient, or food and drink for promoting the proliferation of immune cells comprising at least one compound selected from compounds represented by the formula (I) and the like as an active ingredient.COPYRIGHT: (C)2016,JPO&INPIT【課題】長年食されて安全性が経験的に確認されている天然物由来の成分を有効成分とする免疫細胞増殖促進剤、免疫賦活剤、及び飲食品の提供。【解決手段】式(I)等で表される化合物から選ばれる少なくとも1種又は2種以上の化合物を有効成分とする免疫細胞増殖促進剤又は免疫賦活剤、或いは、式(I)等で表される化合物から選ばれる少なくとも1種又は2種以上の化合物を有効成分として含有する免疫細胞の増殖を促進するための飲食品。【選択図】なし