A sphygmomanometer includes a pulse wave detecting section, a pulse wave amplitude calculation section, a pace change calculation section, and a pulse wave amplitude correction section. The pulse wave detecting section detects pulse waves, and the pulse wave amplitude calculation section calculates an amplitude of a pulse wave. The pace change calculation section calculates the amount of change of the increasing/decreasing pace of the cuff pressure between pulse waves based on the difference between the increasing/decreasing pace of the cuff pressure during a period of the pulse wave and the increasing/decreasing pace of the cuff pressure during a period of a preceding pulse wave. The pulse wave amplitude correction section corrects the amplitude of the pulse wave based on the amount of change of the increasing/decreasing pace of the cuff pressure. A blood pressure value is determined based on the corrected amplitude of the pulse wave.