A degree of reliability of blood pressure data including a blood pressure value for each heartbeat, which is obtained by measuring blood pressure using one or more pressure sensors, is calculated. A blood pressure measurement apparatus according to an aspect includes: a blood pressure meter configured to obtain blood pressure data including a blood pressure value for each heartbeat by detecting a pressure pulse wave using one or more sensors； an extraction unit configured to extract one or more feature amounts of the blood pressure data； and a calculation unit configured to calculate a degree of reliability indicating how accurately the blood pressure data indicates the blood pressure values, based on the feature amount.
