PROBLEM TO BE SOLVED: To provide a blood pressure measuring instrument for measuring a blood pressure value with high accuracy and measuring a subject in a relaxed natural posture during the measurement.SOLUTION: The blood pressure measuring instrument has a rotary center axis at a position where a distance to an armrest position center E from the upper arm insertion surface S1 of an organism insertion part housing 140 at an angle of "the first angle (&theta1) =20 degrees" is larger than a distance to the armrest position center E from the upper arm insertion surface S1 of the organism insertion part housing 140 at an angle of "the second angle (&theta2) =35 degrees " which is larger than the first angle.COPYRIGHT: (C)2010,JPO&INPIT【課題】高い精度で血圧値を測定することが可能であり、測定中において被験者に、無理なく自然な姿勢にて測定を行なうことが可能となる血圧測定装置を提供する。【解決手段】この血圧測定装置は、「第1角度(θ1)=20度」おける生体挿入部筐体140の上腕挿入面S1から肘置き位置中心Eまでの距離よりも、第1角度よりも大きい角度である「第2角度(θ2)=35度」における生体挿入部筐体140の上腕挿入面S1から肘置き位置中心Eまでの距離の方が大きくなる位置に回転中心軸が設けられる。【選択図】図7
