A wireless communication unit of the present invention comprises: an interface portion signally connected to a connector of a main device, the connector being dedicated to a recording-medium; a recording portion performing non-volatile recording; a wireless communication portion performing wireless communication; and a control portion transmitting information to be recorded through the wireless communication portion to an external destination and generating a backup of the information in the recording portion, the information being inputted from the main device to the control portion through the interface portion. Consequently, obtained is a wireless communication unit capable of being readily fitted even to a main device without a general-purpose card connector provided therein, and also capable of preventing important information from being lost even if the wireless communication fail.