A biosignal amplifying device includes: an operational amplifier (op-amp) a capacitor load including a first capacitor connected with a first input terminal of the op-amp, and in which a first voltage is inputted from a first electrode, and a second capacitor which is connected with a second input terminal of the op-amp, and in which a second voltage is inputted from a second electrode a feedback capacitor load including a first feedback capacitor connected with the first input terminal and an output terminal, and a second feedback capacitor connected with the second input terminal and a feedback resistor load including a first feedback resistor connected with the first input terminal and the output terminal, and a second feedback resistor connected with the second input terminal.
