A condenser microphone comprising: a mic capsule in which a capacitor is composed of a diaphragm and a counter electrode, and which effects electroacoustic conversion; a FET for impedance-converting audio signals output from the mic capsule; and a CR circuit composed of a resistor and a capacitor, and connected to the FET to adjust a signal level in a low frequency range, and in the condenser microphone, an output terminal may be drawn out from a drain of the FET; and the CR circuit may be connected in between a source of the FET and the ground, furthermore, in the condenser microphone, there may be provided a changeover switch for switching a mode in which the CR circuit is connected in between the source of the FET and the ground into another mode in which the CR circuit is short-circuited to connect the source of the FET to the ground.