A mobile terminal having a detachable sub-module is disclosed. The mobile terminal includes a sub-module having a sub-function configuration unit formed with parts for performing a function and a main terminal having a display unit at a front surface and a connection unit at a rear surface for coupling the sub-module to the main terminal. A magnet is installed at a side surface of the connection unit or the sub-module, and the sub-module is coupled to the main terminal or is detached from the main terminal through the magnet. Enhancement of the portability and function quality of mobile terminals that support various functions is achieved by coupling a sub-module for performing a function to the main terminal having a display unit that allows user interactivity with the mobile terminal.