A hinge mechanism includes a base, a resilient mechanism, a rotating shaft, a first cam member and a second cam member. The resilient mechanism is movably disposed on the base. The rotating shaft is rotably disposed through the base. The first cam member abuts against the resilient mechanism and is able to slide along the rotating shaft. The first cam member is able to move with the rotating shaft. The second cam member is mounted on the base and engages with the first cam member. The first cam cooperates with the second cam member during rotation with the rotating shaft, resulting in displacement between the first cam member and the second cam member for forcing the resilient mechanism to deform and generates a resilient recovery force. The resilient recovery force recovers the first cam member and the second cam member.