The fetal heart rate extraction device is a variable amplifier which amplifies an input signal in which the heartbeat component of the mother and the heartbeat component of the fetus are mixed, and the acquisition part which removes the heartbeat component of the mother from the input signal to acquire the heartbeat component of the fetus and the heart rate of the fetched fetuses A peak detector is provided for detecting the peak of the component and controlling the variable amplifier to a gain corresponding to the amplitude of the peak.胎児心拍抽出装置は、母体の心拍成分と胎児の心拍成分とが混在する入力信号を増幅する可変増幅器と、前記入力信号から前記母体の心拍成分を除去して前記胎児の心拍成分を取得する取得部と、取得した前記胎児の心拍成分のピークを検出して前記可変増幅器を前記ピークの振幅に応じたゲインに制御するピーク検出部と、を備える。
