Abstract: A connecting structure for a first swivel shaft and a second swivel shaft includes a connecting plug, a connecting socket, and positioning members. The connecting plug extends from an end of the first swivel shaft and includes an extending portion having engaging surfaces. The connecting socket is formed on an end of the second swivel shaft and defines a receiving hole receiving the extending portion of the connecting plug. The positioning members are positioned in the inner surface of the receiving hole. Each of the positioning members includes a resisting point abutting one engaging surface of the extending portion such that the extending portion of the connecting plug is non-rotatable relative to the connecting socket. Projections of the resisting points of the positioning members form a circle concentric with the second swivel shaft on a plane perpendicular to the axis of the second swivel shaft.