the invention relates to an agent for preventing , improving or treating hypertension , which exhibits a hypotensive effect , inhibits the rise of blood pressure and improves hypertension , and food for preventing or improving hypertension , which does not become a burden in daily intake , has a higher antihypertensive effect and is useful as a diet during treatment for patients of hypertension . the agent for preventing , improving or treating hypertension contains the following components and : a compound selected from the group consisting of caffeic acid , chlorogenic acid and ferulic acid , and esters and pharmaceutically acceptable salts thereof ; and a component selected from the group consisting of central nervous system stimulating components , food fibers , extracts of perennial evergreen leaves of the genus camellia , theaceae , or eucommia ulmoides oliver , eucommiae , organic acids having a molecular weight of 60 to 300 and pharmaceutically acceptable salts thereof , and sugar alcohols .