A hinge assembly includes a shaft, a seat made of plastic, a follower, a cam, a latching member, a resilient member, and a sleeve. The follower includes a cam surface. The seat is fixed to the follower, and the seat and the follower are placed around the shaft. The cam has a latching cam surface, the cam surface is engaged with the cam latching surface. The latching member is fixed to the cam, and the cam and the latching member are placed around the shaft. An outer diameter of the cam is smaller than the latching member. The resilient member is placed around the shaft and provides an elastic force to make the cam surface abut against the latching cam surface. The sleeve receives the cam, the latching member, and the resilient member, and the latching member engages with the sleeve.