An electrical connector includes an insulating housing and a terminal assembly. The insulating housing has a base body. A front surface of the base body extends frontward to form a stepping portion. A front surface of the stepping portion extends frontward to form a tongue portion. The terminal assembly includes at least two ground terminals, at least two power terminals and at least two detecting terminals fastened to the insulating housing. The at least two ground terminals are mounted to two outermost portions of two opposite sides of the tongue portion. The at least two power terminals are mounted to the two opposite sides of the tongue portion. The at least two detecting terminals are disposed in a middle of the tongue portion, and the at least two power terminals surround the at least two detecting terminals.