A dual connection member allowing a liquid crystal display unit and a keypad of a mobile phone to rotate and a hinge device thereof are provided. The dual connection member may be used in a mobile phone wherein the mobile phone includes a first housing, a second housing and a dual connection member for interconnecting the first housing and the second housing in such a manner that the second housing is rotatable about a first hinge axis toward or away from the first housing, wherein the first and second housings are connected to the dual connection member in such a manner as to be rotatable about third and second hinge axes, respectively, which extend perpendicular to the front and rear faces of the first and second housings, respectively, the third and second hinge axes being eccentrically positioned in relation to the centers of the first and second housings, respectively, and allowed to be slid as the first and second housings are rotated.