The vehicle-mounted acoustic apparatus of the present invention can be connected to a mobile phone 50; can receive hands-free conversations from the mobile phone 50 and radio broadcasts; and provides a microphone 3 for collecting the sounds of a user, and a speaker 2 for producing the sounds of a radio broadcast or a conversing party. When operating a plurality of preset keys 9a-f that are used for selecting the frequency of radio broadcasts to be received, it is possible to select a phone number that has been stored in the mobile phone 50 or the vehicle-mounted acoustic apparatus, or input the numerals or symbols that constitute the phone number.