PROBLEM TO BE SOLVED: To provide a new bile acid secretion promoter.SOLUTION: A compound having an iridoid skeleton, to be more precise, at least one selected from the group consisting of eucommiol, 1-deoxyeucommiol, epieucommiol, asperuloside, asperulosidic acid, deacetyl asperulosidic acid, scandoside 10-O-acetate, geniposidic acid, aucubin, eucomoside A, eucomoside B and eucomoside C is used as an active ingredient of the bile acid secretion promoter.