A blood pressure measurement instrument includes: a cuff capable of being worn at a measured position on a body of a user, a pressure sensor, a sound sensor, a pressure regulator, and a processor. The pressure regulator is configured to regulate a pressure applied to the measured position by the cuff the pressure sensor is configured to acquire the pressure applied to the measured position by the cuff during a period of time when the pressure is changed the sound sensor is positioned between the cuff and the measured position in a measuring process and is configured to acquire blood flow sound at the measured position and the processor is connected with the pressure sensor and the sound sensor and is configured to determine a blood pressure value of the user according to acquisition results of the pressure sensor and the sound sensor.
