PROBLEM TO BE SOLVED: To provide an agent allowing inhibition of angiotensin-converting enzyme action for indirect relaxation of vascular smooth muscle, having an action of suppressing blood pressure elevation by direct action on the vascular smooth muscle for relaxation of the vascular smooth muscle, permitting daily administration due to its safety, and being capable of continuously suppressing blood pressure elevation.SOLUTION: A blood pressure elevation-suppressing agent has, as an active ingredient, an ethyl acetate extract of a substance obtained by extracting a post-fermented tea with hot water.