An electrical connecting device includes an insulated body, a first terminal set, and a conductive shielding member. The insulated body includes a base and a tongue plate connected to the base. The first terminal set includes several first signal terminals and several first ground terminals. Each of the first signal terminals and the first ground terminals includes a fixed portion and a contact portion. The fixed portion of each of the first signal terminals and the fixed portion of each of the first ground terminals is in the base, and the contact portion of each of the first signal terminals and the contact portion of each of the first ground terminals are extending to the tongue plate and exposed from the tongue plate. The conductive shielding member is in the insulated body, and the conductive shielding member is near but not in contact with the first terminal set.