PROBLEM TO BE SOLVED: To provide an automatic blood pressure measuring apparatus which reduces burdens to be put on a living body when monitoring a blood pressure of the living body and is easy to handle.SOLUTION: In the state where the compression pressure value PC of a pressure band 12 including a plurality of expansion bags 22, 24 and 26 which are connected in the width direction and provided with independent air chambers for respectively compressing an upper arm 10 is a first pressurization target pressure value PCM1, a time difference t31 between pulse wave signals SM3 and SM1 extracted respectively from at least two of the plurality of expansion bags is successively calculated for each beat, an average time difference t31_average which is the average value is calculated, and the blood pressure measurement of the living body is started when the change rate Rt31 of the average time difference t31_average becomes equal to or larger than a preset determination value Z. Thus, the blood pressure is not measured when the change of the blood pressure value BP of the living body is small and in a stable state. Also, it can be detected that the change of the blood pressure value BP of the living body is small and that it is in the stable state just by the pressure band 12.COPYRIGHT: (C)2012,JPO&INPIT【課題】生体の血圧監視時に生体に与える負担を軽減するとともに取り扱いが容易な自動血圧測定装置を提供する。【解決手段】幅方向に連ねられて上腕10を各々圧迫する独立気室を有する複数の膨張袋を有する圧迫帯12の圧迫圧力値PCが第1昇圧目標圧力値PCM1とされた状態において、複数の膨張袋のうちの少なくとも2つの膨張袋からそれぞれ抽出される脈波信号SM3とSM1との間の時間差t31を一拍毎に逐次算出し、それらの平均値である平均時間差t31_averageを算出し、その平均時間差t31_average の変化率Rt31が予め設定された判定値Z以上となった場合に生体の血圧測定を開始する。そのため、生体の血圧値BPの変化が小さく安定状態にあるときは血圧測定が行われない。また、上記生体の血圧値BPの変化が小さく安定状態にあることが圧迫帯12だけで検出可能である。【選択図】図5
