An electrical connector including a base member and a plurality of first terminals disposed in the base member is provided. Each of the first terminals has an contact segment and an tail segment opposite to each other. The contact segments respectively belong to two different parallel planes, and the tail segments are located on a same plane. The first terminals form a plurality of terminal sets in the tail segments, and each of the terminal sets includes a ground terminal, a pair of super speed differential terminals, and a power terminal which are adjacent to each other and are sequentially arranged.