BLOOD PRESSURE ESTIMATING APPARATUS, METHOD FOR ESTIMATING BLOOD PRESSURE, AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM HAVING STORED THEREIN PROGRAM FOR ESTIMATING BLOOD PRESSURE
A blood pressure estimating apparatus includes: a detecting unit that detects a first parameter representing a period length being a length of a period of a heartbeat of a living body; a processing unit that determines, using the detected first parameter, a change of a volume of at least one vessel among a plurality of vessels that resiliently deform in a mathematical model with respect to time, the mathematical model expressing blood flowing in a circulatory system of the living body with fluid flowing through a flow path formed by annularly coupling the plurality of vessels, and estimates blood pressure of the blood using the determined change and the mathematical model.