PROBLEM TO BE SOLVED: To provide an automatic blood pressure measurement device which is capable of obtaining an accurate pulse wave by properly applying a compression pressure to an artery in a part to be compressed and capable of obtaining a highly accurate systolic blood pressure value on the basis of the pulse wave.SOLUTION: A systolic blood pressure value is determined on the basis of a compression pressure to be applied when a first amplitude ratio to be the ratio of an amplitude value coming from an intermediate expansion bag 24 to the amplitude value of a first pulse wave signal SM1 coming from an upstream-side expansion bag 22 exceeds a first amplitude ratio change determination value and a second amplitude ratio to be the ratio of an amplitude value of a third pulse wave signal coming from a downstream-side expansion bag 26 to the amplitude value of the second pulse wave signal coming from the intermediate expansion bag 24 exceeds a second amplitude ratio change determination value. A highly accurate systolic blood pressure value is obtained on the basis of the first amplitude ratio and the second amplitude ratio among the pulse wave signals SM.COPYRIGHT: (C)2013,JPO&INPIT【課題】被圧迫部位内の動脈に圧迫圧力を適正に加えることで正確な脈波が得られ、その脈波に基づいて精度の高い最高血圧値が得られる自動血圧測定装置を提供する。【解決手段】上流側膨張袋22からの第1脈波信号SM1の振幅値に対する中間膨張袋24の振幅値の比である第1振幅比が第1振幅比変化判定値を超え、且つ、中間膨張袋24からの第2脈波信号の振幅値に対する下流側膨張袋26からの第3脈波信号の振幅値の比である第2振幅比が第2振幅比変化判定値を超えたときに、そのときの圧迫圧力に基づいて最高血圧値が決定される。それら脈波信号SM間の第1振幅比、第2振幅比に基づいて精度の高い最高血圧値が得られる。【選択図】図12
