A capacitance measuring circuit for measuring an electrostatic capacitance (Cx) formed between at least one first conductor that receives an AC signal (Vin) and at least one second conductor, the capacitance measuring circuit comprising: signal detection means including: an amplifier including an input and an output; a negative feedback unit that has a feedback capacitance (Cf) and applies a negative feedback from the output of the amplifier to the input of the amplifier; and a DC compensation circuit, wherein the input of the amplifier is connected to the at least one second conductor and is virtually grounded by the negative feedback unit, and the signal detection means outputs an AC signal (Vout) of an amplitude in a functional relation with the electrostatic capacitance (Cx); and measuring means that is connected to an output of the signal detection means and has a function of measuring at least the amplitude of the AC signal output (Vout) from the signal detection means, wherein the DC compensation circuit includes an integrating circuit (Ui, Ri, Ci) having an input connected to the output of the amplifier and a feedback resistance (Rf) connected to an output of the integrating circuit (Ui, Ri, Ci) and the input of the amplifier, and stabilizes a DC component and a low frequency component in an output signal of the amplifier in a direct current manner by applying a negative feedback to the input of the amplifier; characterized in that the DC compensation circuit further includes at least one low-pass filter ((R LPF1, C LPF1), (RLPF2, CLPF2)), the at least one low-pass filter ((R LPF1, C LPF1), (R LPF2, C LPF2)) being provided either between the output of the amplifier and the input of the integrating circuit (Ui, Ri, Ci) or between the output of the integrating circuit (Ui, Ri, Ci) and the feedback resistance (Rf). signal detection means including: an amplifier including an input and an output; a negative feedback unit that has a feedback capacitance (Cf) and applies a negative feedback from the output of the amplifier to the input of the amplifier; and a DC compensation circuit, wherein the input of the amplifier is connected to the at least one second conductor and is virtually grounded by the negative feedback unit, and the signal detection means outputs an AC signal (Vout) of an amplitude in a functional relation with the electrostatic capacitance (Cx); and an amplifier including an input and an output; a negative feedback unit that has a feedback capacitance (Cf) and applies a negative feedback from the output of the amplifier to the input of the amplifier; and a DC compensation circuit, wherein the input of the amplifier is connected to the at least one second conductor and is virtually grounded by the negative feedback unit, and the signal detection means outputs an AC signal (Vout) of an amplitude in a functional relation with the electrostatic capacitance (Cx); and measuring means that is connected to an output of the signal detection means and has a function of measuring at least the amplitude of the AC signal output (Vout) from the signal detection means, wherein the DC compensation circuit includes an integrating circuit (Ui, Ri, Ci) having an input connected to the output of the amplifier and a feedback resistance (Rf) connected to an output of the integrating circuit (Ui, Ri, Ci) and the input of the amplifier, and stabilizes a DC component and a low frequency component in an output signal of the amplifier in a direct current manner by applying a negative feedback to the input of the amplifier; characterized in that the DC compensation circuit further includes at least one low-pass filter ((R LPF1, C LPF1), (RLPF2, CLPF2)), the at least one low-pass filter ((R LPF1, C LPF1), (R LPF2, C LPF2)) being provided either between the output of the amplifier and the input of the integrating circuit (Ui, Ri, Ci) or between the output of the integrating circuit (Ui, Ri, Ci) and the feedback resistance (Rf).