PROBLEM TO BE SOLVED: To provide a technology to calculate a degree of reliability of measured blood pressure information in a blood pressure measuring method by a tonometric system.SOLUTION: A blood pressure measuring device includes measuring means equipped with a plurality of pressure sensors for measuring blood pressure information for each heartbeat of a measurement object, arrangement state estimation means for extracting a feature amount from an output waveform for one heartbeat of each pressure sensor and estimating an arrangement state of the measuring means with respect to an artery of the measurement object based on a distribution shape of feature amount values among the plurality of pressure sensors, and degree-of-reliability calculation means for calculating a degree of reliability of blood pressure information measured by the measuring means based on the estimated arrangement state.SELECTED DRAWING: Figure 5【課題】トノメトリ方式による血圧測定方法において、計測された血圧情報の信頼度を算出する技術を提供する。【解決手段】血圧測定装置は、複数の圧力センサを備え計測対象の一心拍ごとの血圧情報を計測する計測手段と、各々の圧力センサの一心拍分の出力波形から特徴量を抽出し、前記複数の圧力センサの間での前記特徴量の値の分布形状に基づいて、前記計測対象の動脈に対する前記計測手段の配置状態を推定する配置状態推定手段と、前記推定された配置状態に基づいて、前記計測手段により計測された血圧情報の信頼度を算出する信頼度算出手段と、を有する。【選択図】図５
