A hinge assembly adapted to an electronic device is provided. The hinge assembly comprises a fixing member, a sliding shaft, a connecting member, a rotating shaft and a rotating member. A curved guide rail is formed at the side plate. When the sliding shaft is located at a first position and a force applies on the rotating member, the sliding shaft moves from the first position to a second position along the curved guide rail, when the sliding shaft is located at the second position of the curved guide rail and the force applies on the rotating member continuously, the rotating member rotates around the rotating shaft.