The present invention relates to a biosignal measurement device and a contact state estimation method. A biological signal measuring device (60) is a biological signal measuring device attached to a living body for measuring a biological signal of a living body, and includes a amplifier (62a), an A / D converter (62b), a processing portion (63), an n th order differential A signal output unit (64a) and an output unit (65). The amplifier (62a) and the A / D converter (62b) constitute a biological signal measuring section (62) that measures a biological signal from the biosignal sensor (61) and outputs a first signal corresponding to the biological signal ing. The time rate change signal output unit (64) includes an n-th differential signal output unit (64a) to which the first signal is input and which outputs an n th order time rate of change signal (n is an integer of 1 or more) of the first signal, . The processing unit (63) functions as a contact state determination unit that determines the contact state between the biological signal measuring device (60) and the living body based on the n th floor time rate of change signal.本発明は、生体信号測定器及び接触状態推定方法に関する。生体信号測定器(60)は、生体に装着され、生体の生体信号を測定する生体信号測定器で、増幅器(62a)とA/D変換器(62b)と処理部(63)とn階差分信号出力部(64a)と出力部(65)とを備えている。増幅器(62a)とA/D変換器(62b)は、生体信号センサ(61)から生体信号を測定し、生体信号に対応する第1の信号を出力する生体信号測定部(62)を構成している。時間変化率信号出力部(64)は、第1の信号が入力され、第1の信号のn階時間変化率信号(nは1以上の整数)を出力するn階差分信号出力部(64a)を備えている。処理部(63)は、n階時間変化率信号に基づいて、生体信号測定器(60)と生体との接触状態を判定する接触状態判定部として機能する。
