An electrical connector includes an insulating body, and a first terminal group and a second terminal group arranged at the insulating body. The first terminal group has one pair of first signal terminals, and each signal terminal has a first signal leg exposed out of the insulating body. The second terminal group has a second ground terminal and a second power terminal, and the second ground terminal and the second power terminal correspondingly having a second grounding leg and a second power leg exposed out of the insulating body. The second grounding leg, the second power leg and the first signal leg are arranged in a row, and the second grounding leg and the second power leg are provided with only one pair of first signal legs therebetween.