To provide a bioelectrical signal measuring device to be obtained for the DC component not only the AC component of the bioelectric signal. Bioelectrical signal measuring apparatus 100 of the present invention have biological electrodes 11A, a plurality of 11B, the short-circuit means 20, a differential amplifier means 30, the bioelectrical signal extracting unit 40, and a timing control means 50. Contact with the biological surface, the biological electrodes 11A of multiple, 11B are spaced apart from each other. Short-circuiting unit 20 is short-circuited through a short circuit resistance of a given biological electrodes 11A, 11B, and. Differential amplifier means 30 differentially amplifies the electric signal biological electrodes 11A, 11B from the connected biological electrode 11A, to 11B. Bioelectric signal extraction unit 40 extracts the bio-electrical signal from the output signal of the differential amplifier means 30 until the next short short biological electrodes 11A, 11B between is canceled. Timing control means 50 controls the timing to repeat the release of a short-circuit and short-circuit the biological electrode 11A, 11B between. [Selection] Figure Figure 1生体電気信号の交流成分のみならず直流成分についても得られる生体電気信号計測装置を提供する。本発明の生体電気信号計測装置100は、複数の生体電極11A,11Bと、短絡手段20と、差動増幅手段30と、生体電気信号抽出手段40と、タイミング制御手段50と、を有する。複数の生体電極11A,11Bは、生体表面と接し、互いに離隔して配置される。短絡手段20は、生体電極11A,11B間を所定の短絡抵抗を介して短絡する。差動増幅手段30は、生体電極11A,11Bに接続されて生体電極11A,11Bからの電気信号を差動増幅する。生体電気信号抽出手段40は、生体電極11A,11B間の短絡が解除されてから次に短絡されるまでの間に差動増幅手段30の出力信号から生体電気信号を抽出する。タイミング制御手段50は、生体電極11A,11B間の短絡と短絡の解除とを繰り返すタイミングを制御する。【選択図】図1
