A sphygmomanometer according to the present invention includes a pump that supplies a fluid to a blood pressure measurement cuff, a pressure sensor that detects a pressure of the cuff, a first valve for regular measurement, and a second valve for emergency exhaust. A blood pressure measurement unit measures a blood pressure of a measurement target site by controlling operations of the pump and the first and second valves on the basis of the pressure of the cuff. The abnormality determination unit supplies the fluid to the cuff by the pump in a state where a closing instruction is given to the first valve and an opening instruction is given to the second valve, and determines whether or not there is an abnormality in an emergency exhaust function according to a degree of increase in the pressure of the cuff.