To provide an electronic manometer for measuring blood pressure of a measured site by an oscillometric method, which is noninvasive to a subject and can output a cardiac failure index relatively indicating the seriousness of a cardiac failure.SOLUTION: An electronic manometer includes: a cuff pressure control part 58 for changing the pressure of a cuff mounted on a measured site； a pressure detection part 59 for detecting a cuff pressure signal indicating the pressure of the cuff； a variation amount calculating device 69 for obtaining a blood pressure variation amount synchronized with breathing on the basis of the cuff pressure signal； and an index output part 70 for outputting a numerical value predetermined in correspondence with the blood pressure variation amount as a cardiac failure index relatively indicating the seriousness of a cardiac failure.SELECTED DRAWING: Figure 5【課題】被測定部位の血圧をオシロメトリック法により測定する電子血圧計であって、被験者に対して非侵襲で、心不全の重症度を相対的に表す心不全指標を出力できるものを提供すること。【解決手段】この発明の電子血圧計は、被測定部位に装着されたカフの圧力を変化させ得るカフ圧制御部５８と、カフの圧力を表すカフ圧信号を検出する圧力検出部５９と、カフ圧信号に基づいて、呼吸に同期した血圧変動量を求める変動量算出部６９と、血圧変動量に対応して予め定められた数値を、心不全の重症度を相対的に表す心不全指標として出力する指標出力部７０とを備える。【選択図】図５
