To eliminate a troublesome manipulation at measuring the blood pressure and enhance the easiness in handling the device by arranging it so that the blood pressure is calculated on the basis of the pulsation signal obtained through sensing, and therefore, only one sensor, a pulsation sensor, must be put on the body of a subject.

A blood pressure measuring device senses the pulsation generated by blood circulation in a human body using a pulsation sensing means 8, calculates the feature amount related to the blood pressure using a feature amount calculating means 11 on the basis of the pulsation signal obtained through sensing, and calculates the blood pressure using a blood pressure calculating means 18 on the basis of the obtained feature amount. According to this configuration where the blood pressure is determined on the basis of pulsation signals, only one sensor, a pulsation sensor, must be put on the body of a subject to lead to elimination of troublesomeness in manipulation at measuring the blood pressure and enhancement of the easiness in handling the device, and further because the blood pressure measurement is conducted through computation of the feature amount related to the blood pressure, accurate measurements can be obtained even with varying shape of pulsation.