To detect a mounting abnormality of a cuff and avoiding a situation in which blood pressure is measured as the mounting state is not normal.SOLUTION: A blood pressure measuring device for measuring blood pressure using a cuff mounted onto a subject includes a processor and a memory for storing a computer-readable command. When the command is executed by the processor, the blood pressure measuring device acquires a pulse wave signal P while increasing inner pressure of the cuff at a predetermined pressing speed, and, by subjecting it to primary differentiation, acquires a primary differential signal PD1. The blood measuring device detects a mounting state abnormality of the cuff based on at least one of a minimum value PD1b of the primary differential signal PD1, an amplitude change amount per unit time of the primary differential signal PD1 including the minimum value PD1b, relationships of a peak value PD1p of the primary differential signal PD1 with the minimum value PD1b, and relationships of the amplitude change amount per unit time of the primary differential signal PD1 including the peak value PD1p with the amplitude change amount per unit time of the primary differential signal PD1 including the minimum value PD1b.SELECTED DRAWING: Figure 3【課題】カフの装着異常を検出し、装着状態が正常でないまま血圧が測定される事態を回避する。【解決手段】被検者に装着されるカフを用いて血圧を測定する血圧測定装置は、プロセッサとコンピュータが読み取り可能な命令を記憶するメモリとを備えている。当該命令がプロセッサにより実行されると、血圧測定装置は、カフの内圧を所定の加圧速度で上昇させつつ脈波信号Pを取得し、これを一次微分して一次微分信号PD1を取得する。血圧測定装置は、一次微分信号PD1の極小値PD1bと、極小値PD1bを含む一次微分信号PD1の単位時間あたりの振幅変化量と、一次微分信号PD1のピーク値PD1pの極小値PD1bに対する関係と、ピーク値PD1pを含む一次微分信号PD1の単位時間あたりの振幅変化量の極小値PD1bを含む一次微分信号PD1の単位時間あたりの振幅変化量に対する関係の少なくとも一つに基づいて、カフの装着状態の異常を検出する。【選択図】図3
