The present invention is capable of achieving high blood pressure measurement accuracy using a blood pressure meter in which a double cuff structure is adopted. This blood pressure meter comprises: a pressing member that includes a pressing cuff (23) that is configured in a pouch form that is capable of accommodating a fluid, said pressing cuff being wound onto a target measurement area of a subject and generating a pressing force toward the target measurement area by causing the pressing cuff (23) to expand； a sensing cuff (21) that is configured in a pouch form that is capable of accommodating a fluid, and is installed on the surface of the pressing member that faces the to-be-measured area； adjustment devices (30, 33) that adjust the amount of a first fluid in the pressing cuff (23) and the amount of fluid in the sensing cuff (21)； a pressure sensor (32) that detects the pressure inside the sensing cuff (21)； and a control unit (100) that controls actions of the adjustment devices (30, 33) so that an amount of fluid that corresponds to biological information of the subject is accommodated in the sensing cuff (21) and the pressing cuff expands or contracts in this state, and calculates a blood pressure value of the subject from the output of the pressure sensor (32).La présente invention permet d'obtenir une précision de mesure de la tension artérielle élevée à l'aide d'un tensiomètre présentant une structure à deux brassards. Ce tensiomètre comprend : un élément de compression qui comprend un brassard de compression (23) qui est conçu en forme de poche apte à recevoir un fluide, ledit brassard de compression étant enroulé autour d'une zone de mesure cible d'un sujet et générant une force de compression s'exerçant sur la zone de mesure cible en amenant le brassard de compression (23) à se dilater ； un brassard de détection (21) qui est conçu en forme de poche apte à recevoir un fluide, et qui est installé sur la surface de l'élément de compression qui fait face à
