PROBLEM TO BE SOLVED: To accurately determine whether or not each signal is effective in a blood pressure estimation device for estimating blood pressure according to a pulse wave signal and an electrocardiographic signal.SOLUTION: A blood pressure estimation device 1 includes an effectiveness determination part (an electrocardiographic signal analysis part 14, a pulse wave signal analysis part 15, and an electrocardiographic and pulse wave signal analysis part 16) for determining whether or not effective conditions are met about a determination object signal selected from an electrocardiographic signal and a pulse wave signal, and a blood pressure estimation part (the electrocardiographic signal analysis part 14, the pulse wave signal analysis part 15, the electrocardiographic and pulse wave signal analysis part 16, and a blood pressure calculation part 17) for estimating blood pressure when the determination object signal meets the effective conditions. The effectiveness determination part (the electrocardiographic signal analysis part 14, the pulse wave signal analysis part 15, and the electrocardiographic and pulse wave signal analysis part 16) updates the effective conditions according to the determination object signal.SELECTED DRAWING: Figure 1【課題】脈波信号および心電信号に応じて血圧を推定する血圧推定装置において、各信号が有効であるか否かを精度高く判定する。【解決手段】血圧推定装置１は、心電信号および脈波信号から選択される判定対象信号について、有効条件を満たすか否かを判定する有効判定部（心電信号解析部１４、脈波信号解析部１５、心電及び脈波信号解析部１６）と、判定対象信号が有効条件を満たす場合に血圧を推定する血圧推定部（心電信号解析部１４、脈波信号解析部１５、心電及び脈波信号解析部１６、血圧演算部１７）とを備え、有効判定部（心電信号解析部１４、脈波信号解析部１５、心電及び脈波信号解析部１６）は、判定対象信号に応じて有効条件を更新する。【選択図】図１
