PROBLEM TO BE SOLVED: To provide a blood vessel elasticity index value measuring device allowing a blood vessel elasticity index value to be measured under non-pressurization without the need of a pressurization-type sphygmomanometer.SOLUTION: A probe 30 consisting of a first ultrasonic probe 31 and a second ultrasonic probe 32 separated from each other by a prescribed distance Lp is attached to a blood vessel 5 of an examinee 3. Further, first pulse wave velocity of first time being feature time of variations of a blood vessel diameter of the blood vessel 5 in association with pulsation and second pulse wave velocity of second time being the feature time thereof are measured by using a measurement result of the blood vessel diameter based on an input signal of the first ultrasonic probe 31 and a measurement result of the blood vessel diameter based on an input signal of the second ultrasonic probe. Furthermore, a blood vessel elasticity index value of the blood vessel is calculated by using the first pulse wave velocity, the second pulse wave velocity and individual blood vessel diameters of the first time and the second time.SELECTED DRAWING: Figure 1【課題】加圧式の血圧計を不要とし、非加圧下において血管弾性指標値の測定を可能とする血管弾性指標値測定装置を提供する。【解決手段】被検者３の血管５に、所定距離Ｌｐだけ離された第１超音波プローブ３１と第２超音波プローブ３２とからなるプローブ３０を取り付ける。そして、第１超音波プローブ３１の受信信号に基づく血管径の測定結果と、第２超音波プローブの受信信号に基づく血管径の測定結果とを用いて、拍動に伴う血管５の血管径変動の特徴期である第１時期の第１脈波伝播速度および第２時期の第２脈波伝播速度を測定する。そして、第１脈波伝播速度、第２脈波伝播速度、および、前記第１時期並びに前記第２時期それぞれの血管径、を用いて血管の血管弾性指標値を算出する。【選択図】図１
