A folding mechanism includes a pivot seat unit and at least three support units disposed about an axial line and pivotally connected to the pivot seat unit. Each of the support units includes a support rod. Rotation of any one of the support rods of the support units relative to the pivot seat unit drives an adjacent one of the support rods to rotate, such that when any one of the support rods is rotated relative to the pivot seat unit, the other support rods are in turn driven to rotate relative to the pivot seat unit so as to convert the support units between a folded state and an unfolded state.