Patent ID: 8517951

Claim:
A blood pressure information measurement device for calculating a pulse wave velocity that is an arterial stiffness index of a subject as blood pressure information, the blood pressure information measurement device comprising: an air bladder arranged to be placed on a measurement site of the subject; an adjustment device arranged to adjust an internal pressure of the air bladder; and an arithmetic operation device arranged and programmed to perform processing to calculate the pulse wave velocity of the subject based on a change in internal pressure of the air bladder; wherein the arithmetic operation device is programmed to execute: an arithmetic operation to obtain a blood pressure value of the subject from the change in internal pressure; an arithmetic operation to obtain a pulse wave waveform for one beat from the change in internal pressure; an arithmetic operation to obtain a time difference between an appearance of an ejected wave and an appearance of a reflected wave in the pulse wave waveform for one beat; an arithmetic operation to determine a difference in respective propagation paths of the ejected wave and the reflected wave from a heart to the measurement site, based on the blood pressure value and a value representing a distance from an aortic root to an iliac artery bifurcation that is stored in advance; and an arithmetic operation to obtain the pulse wave velocity of the subject based on the propagation path difference and the time difference.