An audio output amplifier includes a plurality of amplification circuits that drive a plurality of electroacoustic conversion devices, respectively. Each of the plurality of amplification circuits includes a current detection resistance that is provided between a path of a current which is supplied to the corresponding electroacoustic conversion device; and a current controller that generates a voltage between both ends of the current detection resistance, the voltage being proportional to a voltage value of an audio input signal supplied to the corresponding amplification circuit.