An electrical plug connector includes a plurality of terminals and an insulator, a pair of grounding latches, a shielding spring and a shielding shell. Each of the terminals has a contacting segment and an elastic segment. Each of the contacting segments has a stopping face. The insulator partially covers the terminals and has a plurality of stopping edges. When the electrical plug connector is inserted into an electrical receptacle connector, shape deformation of each of the elastic segments shifts the corresponding contacting segment until the corresponding stopping edge is against the corresponding stopping face, and each contacting segment does not protrude from the insulator. When the electrical plug connector is not inserted into the electrical receptacle connector, shape recovery of each of the elastic segments restores the corresponding contacting segment and the corresponding stopping edge is away from the stopping face.