A CPU of a blood pressure information measurement device calculates blood pressure from a change in internal pressure of an air bladder used to measure the blood pressure. AI (augmentation index) and Tr (traveling time to reflected wave) are calculated from a pulse wave waveform. A path difference calculation unit of the CPU stores a correction equation to correct a pulse wave propagation distance that is stored in advance, and, by substituting the calculated blood pressure value, AI and the like into the correction equation, corrects the pulse wave propagation distance stored in advance and approximates the pulse wave propagation distance stored in advance to an actual pulse wave propagation distance. A PWV (pulse wave velocity) calculation unit calculates the PWV using the corrected distance.
