PURPOSE: To simplify switching operation by switching an audio input selector to a radio input device when the reception state of the radio receiver is switched.

CONSTITUTION: The input selector 12 of the audio reproducing device 11 has input selection switches 14a, 14b, 14c, 14d, an electronic switch circuit 13 is switched by depressing the switch and each audio input is selected and also muting is applied by a muting circuit 15 for a prescribed time. When a frequency band of the radio receiver 1 is switched, a pulse is outputted and transistors 10, 18 are operated, the same state as the depression of the switch 14a for radio input is attained and the electronic switch circuit 13 is switched to the radio input. Moreover, a muting signal is outputted from a terminal 6a of a phase locked loop integrated circuit 6 and the muting circuit 15 is operated.