This blood pressure information measurement device is provided with: a cuff including a first fluid bag, and a second fluid bag which is accommodated inside the first fluid bag； a pressure increase/decrease mechanism which increases and decreases the pressures of internal spaces of the first fluid bag and the second fluid bag； a control unit which controls the operation of the pressure increase/decrease mechanism； a pressure detection device capable of detecting the internal pressure of the first fluid bag； and a calculation unit which calculates blood pressure information. When the blood pressure information is calculated using the pressure detection device and the calculation unit, the control unit pressurizes the internal space of the second fluid bag while stopping the pressurization of the internal space of the first fluid bag, to increase the internal pressure of the second fluid bag such that the pressure difference between the internal pressure of the second fluid bag and the internal pressure of the first fluid bag reaches a prescribed value, and subsequently pressurizes both the internal space of the first fluid bag and the internal space of the second fluid bag such that the pressure difference is maintained at the prescribed value.Cette invention concerne un dispositif de mesure d'informations de tension artérielle comprenant : un brassard constitué d'une première poche de fluide, et d'une seconde poche de fluide logée à l'intérieur de la première ； un mécanisme d'accroissement/diminution de pression qui accroît et diminue les pressions des espaces internes de la première poche de fluide et de la seconde poche de fluide ； une unité de commande qui commande le fonctionnement du mécanisme d'accroissement/diminution de pression ； un dispositif de détection de pression qui détecte la pression interne de la première poche de fluide ； et une unité de calcul qui calcule les informations de tension artérielle. Quand les informations de tension artérielle sont ca
