A pivot structure includes a base, a bracket, an elastic component, and a positioning assembly. The bracket is rotatably connected to the base. The elastic component is disposed on the base. The positioning assembly includes an elastic clip and a pillar. The elastic clip is pivoted to the base and has a first releasing segment and a first positioning segment. The pillar is connected to the bracket and has a second positioning segment. The pillar is rotatably clipped in the elastic clip. The bracket is adapted to be expanded to a first expanding state through an elastic force of the elastic component, so as to drive the second positioning segment to move along the first releasing segment. The bracket is adapted to receive an external force to be further expanded to a second expanding state, so as to drive the second positioning segment to move to the first positioning segment.