An electrical plug connector includes a metallic shell, an insulated housing in the metallic shell, plug terminals held in the insulated housing, and a hook member. Hook portions of the hook member extend into the insertion cavity of the insulated housing. Each hook portion forms a first positioning portion and a second positioning portion. When the electrical plug connector is mated with an electrical receptacle connector, the electrical plug connector can be positioned with the electrical receptacle connector through multiple contacts, thereby preventing the electrical plug connector from shaking.