PROBLEM TO BE SOLVED: To provide a new method of measuring blood pressure for improving the degree of accuracy in computing blood pressure.SOLUTION: In an ultrasonic sphygmomanometer 1, a blood pressure estimating part 140 estimates the blood pressure of a subject by using the difference in vessel diameters which is a difference between a first vessel diameter and a second vessel diameter that are measured by a vessel diameter measuring part 110 when a region to be measured is placed at a first position and a second position that are different in the relative height relative to the heart, a correlation formula 821 that sets correlation characteristics between the blood pressure and the vessel diameter of the blood vessel to be measured, and a water head pressure difference based on a difference in a height direction between the first position and the second position.COPYRIGHT: (C)2013,JPO&INPIT【課題】血圧の算出精度を向上させるための新しい血圧計測手法の提案。【解決手段】超音波血圧計1において、心臓に対する相対的な高さが異なる第1位置及び第2位置に計測対象部位を位置させた時に血管径計測部110により計測された第1血管径及び第2血管径の差である血管径差と、血圧と計測対象血管の血管径との相関特性を定めた相関式821と、第1位置及び第2位置の高さ方向の差に基づく水頭圧差とを用いて、血圧推定部140が被検者の血圧を推定する。【選択図】図6
