An electrical connector is provided in the present invention, including an insulating housing, a first group of conductive terminals, a second group of conductive terminals and a third group of conductive terminals. A mating section of the insulating housing forms a receiving cavity, which disposes at least one horizontal division plate therein to form multiple receiving semi-cavity. A horizontal retaining section and a vertical retaining section of each conductive terminal are received and retained into the mounting section of the insulating housing, the tails thereof extend outside the bottom surface of the mounting section, and the flexible contact section enters into the corresponding receiving semi-cavity of the mating section. The electrical connector of the present invention disposes a wider complementary margin along an up and down direction and a left and right direction, thereby ensuring a safe connection of the electrical connector and a complementary connector.