Sphygmomanometer, personal authentication method on a sphygmomanometer, and computer-readable recording medium

A sphygmomanometer including a cuff configured to compress a site to be measured of a subject and measuring a blood pressure by observing a pressure of the cuff, the sphygmomanometer comprising:

• a pump and a valve each fluidly connected to the cuff;
• a pressure sensor that detects a pressure of the cuff;
• and
• a processor, wherein
• the processor is configured to act as:
• a pressure control unit to perform control, while acquiring the pressure of the cuff from the pressure sensor, so as to supply a fluid from the pump to the cuff to pressurize the cuff or discharge the fluid from the cuff through the valve to depressurize the cuff;
• a blood pressure calculation unit to calculate a blood pressure based on the pressure of the cuff;
• a feature acquisition unit to acquire, for a subject to be authenticated, feature information regarding a pressure change pattern of the cuff with a lapse of time from a start of pressurization in a pressurization process of the cuff, the feature information including feature information regarding a direct-current pressure change pattern whose increase rate increases over time according to a direct-current component of the pressure of the cuff;
• and
• an authentication unit to perform personal authentication on the subject by comparing the acquired feature information with registered feature information on a user registered in advance.