A hinge module including a first body; a second body arranged with respect to the first body; a hinge configured to hinge in response to an angle variation between the first body and the second body; and a display disposed on the first body and the second body. Further, the hinge includes a first hinge housing including an accommodating portion; a second hinge housing having a first end inserted in the accommodating portion; an arc-shaped hinge hole in the second hinge housing; a hinge pin projecting from an inner surface of the accommodating portion of the first hinge housing and penetrating the arc-shaped hinge hole in the second hinge housing; a guide pin coupled to the first hinge housing and inserted into a second end of the second hinge housing; and an elastic member provided in the second end of the second hinge housing and including a curved surface contacting the guide pin.