BLOOD PRESSURE ESTIMATION DEVICE

PROBLEM TO BE SOLVED: To provide a blood pressure estimation device which can perform highly precise blood pressure estimation.SOLUTION: A digital computing unit 16 uses a pulse wave signal and an electrocardiogram signal to estimate blood pressure. Further, the quality value q1 of the pulse wave signal and the quality value q2 of the electrocardiogram signal are computed to determine whether a sensor signal is good or not based on the quality values q1, q2. Moreover, the correlation value of noises of the respective sensor signals is calculated from a cross-correlation function, and whether the noises of the pulse wave signal are living body-originated or contact-originated is determined from the noise correlation value. Then, when all of the sensor signals are good and when all of the sensor signals are bad and the correlation value of noise is higher than a predetermined value, a blood pressure quality flag is put up. When the blood pressure quality flag is put up, a blood pressure value estimated by a blood pressure estimation logic 24 is stored. When a predetermined number of times of estimated blood pressure values are received, the average value of stored blood pressure values is calculated.