To provide a novel blood pressure measuring method and device which can make a more accurate estimation on an individual basis.

Four kinds of basic factors, i.e., maximum blood pressure, minimum blood pressure, pulse rate, and left ventricle contraction time, are measured at every fixed time from the start of exercise to the recovery of a normal condition after the end of the exercise under fixed load conditions, these measuring points are connected, and, with a value set at zero immediately before an exercise load, an integrated value of time-series fluctuations is automatically processed by a computer 1 with the inputs of the four kinds of basic factors and time. In this case, the exercise comprising walking on an upright treadmill, the maximum blood pressure is determined at the point where a notch is generated in the anacrotic site of a brachial artery microaperture displacement waveform as cuff pressure decreases, the minimum pressure is determined at the dissipation point of the notch, the pulse rate is calculated from the intervals on the arterial pressure waveforms recorded, the left ventricle contraction time is calculated by adding paper feed rate to the time lag between the anacritic starting point and catacrotic notch of the pressure waveform immediately after the minimum blood pressure, and pulse waveforms are analyzed through a filter for display.