PROBLEM TO BE SOLVED: To accurately grasp an invasive blood pressure value of a subject himself or herself even during using IABP.SOLUTION: Electrocardiogram measuring means 11 measures the electrocardiogram of the subject. Blood pressure waveform measuring means 12 measures a blood pressure waveform of the subject by an invasive method. Self-cardiac blood pressure measuring means 13 detects one cardiac cycle of a heart from the electrocardiogram, and calculates at least one between systolic pressure and the diastolic pressure of the subject himself or herself on the basis of a detection state of a blood pressure maximum value within the blood pressure waveform of one cardiac cycle.SELECTED DRAWING: Figure 1【課題】ＩＡＢＰの使用時であっても被験者自身の観血式血圧値を正確に把握すること。【解決手段】心電図測定手段１１は、被験者の心電図を測定する。血圧波形測定手段１２は、被験者に対して観血的な手法で血圧波形を測定する。自己心拍血圧算出手段１３は、心電図から心臓の一心周期を検出し、当該一心周期内の血圧波形の血圧極大値の検出状態に基づいて、被験者自身の収縮期圧及び拡張末期血圧の少なくとも一方を算出する。【選択図】図１
