PROBLEM TO BE SOLVED: To achieve continuous blood pressure measurement with a high degree of precision without needing calibration in the middle of the measurement.SOLUTION: A blood pressure measuring device irradiates an ultrasonic wave onto a predetermined blood vessel, and measures blood pressure based on reception signals of a first ultrasonic sensor and a second ultrasonic sensor for receiving the reflective wave. The blood pressure measuring device includes: a blood vessel diameter calculation part for calculating a first blood vessel diameter which is a blood vessel diameter in a first position of the predetermined blood vessel using the reception signal of the first ultrasonic sensor, and calculating a second blood vessel diameter which is a blood vessel diameter in a second position of the predetermined blood vessel using the reception signal of the second ultrasonic sensor a pulse wave propagation speed calculation part for calculating a pulse wave propagation speed using the first blood vessel diameter and the second blood vessel diameter a blood pressure calculation part for calculating blood pressure using the first blood vessel diameter or the second blood vessel diameter, the pulse wave propagation speed, a given reference blood vessel diameter, and given reference blood pressure and a reference value update part for updating the reference blood vessel diameter by the first blood vessel diameter or the second blood vessel diameter, and updating the reference blood pressure by the blood pressure.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2017,JPO&INPIT【課題】途中で校正を必要とすることなく、継続的な血圧測定を高精度に実現すること。【解決手段】所定血管に超音波を照射し、その反射波を受信する第1超音波センサーおよび第2超音波センサーの受信信号に基づいて血圧を測定する血圧測定装置であって、前記第1超音波センサーの受信信号を用いて前記所定血管の第1位置の血管径である第1血管径を算出し、前記第2超音波センサーの受信信号を用いて前記所定血管の第2位置の血管径である第2血管径を算出する血管径算出部と、前記第1血管径と前記第2血管径とを用いて脈波伝播速度を算出する脈波伝播速度算出部と、前記第1血管径又は前記第2血管径と、前記脈波伝播速度と、所与の基準血管径と、所与の基準血圧とを用いて血圧を算出する血圧算出部と、前記第1血管径又は前記第2血管径で前記基準血管径を更新し、前記血圧で前記基準血圧を更新する基準値更新部と、を備える血圧測定装置である。【選択図】図4
