The present invention provides a mobile communication terminal, and more particularly, a folding-type mobile communication terminal provided with a locking device that selectively restricts use of the terminal via user authentication. In one embodiment, the present invention includes a housing including first and second housing portions mutually joined together via a hinge, wherein the housing can be opened and closed by rotation of the first and second housing portions about the hinge. An authentication means for enabling user authentication while the housing is closed is provided, wherein the authentication means is included on an exterior of the housing. Also a locking means is provided for preventing the housing from being opened while the user is not authenticated via the user authentication means, wherein the locking means is included in the housing.