SOLUTION: A bioelectrical signal is mixed with a reference signal, the electrostatic capacitance between the biological composition and the input means is detected from the intensity of the reference signal, and the gain correction of the bioelectric signal is performed on the basis of the detected electrostatic capacitance It was made to do.【解決手段】 生体電気信号に基準信号を混合させ、基準信号の強度から生体組成と入力手段との間の静電容量を検出し、検出した静電容量に基づいて生体電気信号の利得補正を行うようにした。
