PROBLEM TO BE SOLVED: To provide a bioelectric signal detector which removes noise from a bioelectric signal, while making a dynamic range small.SOLUTION: The bioelectric signal detector includes a plurality of detecting means 100 (such as 100a, 100b, 100c) which include electrodes E (such as ch1, GND, REF) detecting electric signals generated in a user and amplification means 101 (such as 101c) for amplifying the electric signals detected by the electrodes, and one or a plurality of differential amplification means 110 (such as 110a) which differentially amplify two of signals output from the detecting means 100. The amplification means 101 have input impedance higher than contact impedance of the user with the electrodes and are provided between the electrodes E and the differential amplification means 110.COPYRIGHT: (C)2012,JPO&INPIT【課題】ダイナミックレンジを小さくしつつ、生体電気信号からノイズを除去する生体電気信号検出装置を提供すること。【解決手段】生体電気信号検出装置は、ユーザに発生する電気信号を検出する電極E(ch1、GND、REFなど)と、電極で検出される電気信号を増幅させる増幅手段101(101cなど)とを含む複数の検出手段100(100a、100b、100cなど)と、複数の検出手段100から出力される信号のうちの2つを差動増幅する一又は複数の差動増幅手段110(110aなど)とを含む。増幅手段101は、ユーザ及び電極の接触インピーダンスより高い入力インピーダンスを有し、電極Eと差動増幅手段110との間に設けられる。【選択図】図11
