Provided is a method of treating hypertension, which comprises administering an effective amount of a compound represented by the following formula (1) or (2): wherein, R1 and R2 are the same or different and each independently represents hydrogen, alkyl, alkenyl, cycloalkyl, cycloalkenyl, alkoxyalkyl, aryl, alkylaryl, aralkyl, or acyl, R3 represents hydroxyl, ester bond residue, or amide bond residue, R4 represents ester bond residue or amide bond residue, or a pharmaceutically acceptable salt thereof (except ferulic acid). When the preventive or remedy for hypertension according to the present invention is administered, ferulic acid exists in the blood for a long period of time, thereby continuously suppressing a blood pressure rise. Moreover, the hypertension preventive or remedy according to the present invention has reduced in bitterness peculiar to ferulic acid, which enables patients to take it continuously.