A hinge mechanism includes a first lap joint structure disposed on one end of each linkage component rotatably connected to a base, and extends in a direction from one end of the base to a mounting bracket located on a same side as the first lap joint structure, and a second lap joint structure disposed on one side of each support plate and that faces the base and extends in a direction from the side of the support plate to the base, wherein a second surface of the second lap joint structure slides along a surface of the first lap joint structure when two mounting brackets are relatively folded or unfolded.