The present invention is a Bluetooth.TM. hands-free kit structure. After the hands-free module according to the present invention executes Bluetooth.TM. functional pairing with a Bluetooth.TM.-equipped mobile phone, it can be used as a acoustic type hands-free muting system device of Bluetooth.TM.-equipped mobile phone which employs acoustic speakers as its audio output, or can be used as a Bluetooth.TM.-equipped hands-free kit which employs a loudspeaker as its audio output, and also can be used as a Bluetooth.TM. earphone by itself. The Bluetooth.TM. hands-free kit structure can be expanded to have both charging and Bluetooth.TM.-functions, and also can be a module structure with private communication switch capability.