PROBLEM TO BE SOLVED: To improve measurement accuracy of a non-invasive venous pressure measurement system.SOLUTION: A pressure control unit 11 varies a pressure applied to a cuff 21 mounted on a living body's position including a vein and an artery. A pressure sensor 12 detects a pulse wave from pressure that is received from the position by the cuff 21. A venous pressure calculation unit 13 calculates a venous pressure on the basis of pressures applied to the cuff 21 and pulse waves detected by the pressure sensor 12 during variation in the pressure applied to the cuff 21. The pressure control unit 11 repeatedly executes a measurement step of increasing or decreasing the pressure applied to the cuff 21 from an initial value.SELECTED DRAWING: Figure 1【課題】非侵襲式の静脈圧の測定方式の測定精度を高めること。【解決手段】圧力制御部１１は、生体の静脈及び動脈を有する箇所に装着したカフ２１の印加圧力を変化させる。圧力センサ１２は、カフ２１が上記箇所から受ける圧力から脈波を検出する。静脈圧算出部１３は、カフ２１の印加圧力を変化させる間に圧力センサ１２が検出した脈波と、カフ２１の印加圧力と、に基づいて静脈圧を算出する。圧力制御部１１は、初期値からカフ２１の印加圧力を加圧又は減圧させていく測定ステップを複数回実行する。【選択図】図１
