The object of this invention is to provide a hinge apparatus for mobile phones. In the hinge apparatus, a fixed cam is installed in a rotary hinge part, in place of a fixed hinge part, different from conventional hinge apparatuses. Therefore, the design of elements of the hinge apparatus can be preferably changed so as to allow the elements to be easily and simply assembled into a single structure without being scratched. It is thus possible to minimize wobble of the hinge apparatus due to scratches of the elements, and prevent a degradation in the operational performance of the hinge apparatus caused by the wobble.