An electrical connector is used to be electrically connected to a mating component. The electrical connector includes one or more shielding members, forming multiple receiving holes; and multiple terminals, including at least one signal terminal and at least one ground terminal correspondingly accommodated in the receiving holes. The ground terminal has a mating portion upward abutting the mating component, an elastic portion pressed vertically to elastically deform, and a positioning portion having a cross-section in a circular shape. The positioning portion and the shielding members are conductively connected to each other by at least three conductive portions, and the three conductive portions are provided to form a triangle. An insulating block is between the signal terminal and a corresponding shielding member to be accommodated in a corresponding receiving hole. The positioning portion with a circular cross-section has a larger area when the volume of the receiving hole remains unchanged.