An electric connector includes an insulator body, a conducting terminal accommodated in the insulator body and a metal housing wrapping the insulator body, wherein the insulator body is formed through plastic injection; the insulator body has a first section at the front part of the insulator body and a second section extending backwards form the first section; and the dielectric constants of plastic materials of the first section and the second section are different. Compared with the prior art, the electric connector disclosed by the invention has the benefit that the signal transmission of the electric connector is enabled to be more stable.