An electrical connector includes an insulating body having a base portion and a tongue portion extending forward from a front side of the base portion. A top surface of the tongue portion defines a plurality of terminal fillisters each extending along a front-to-rear direction to penetrate through the tongue portion and the base portion. Two inner sides of a front end of each terminal fillister protrude face-to-face to form two holding portions with an interval therebetween gradually narrowing from rear to front. A plurality of terminals each has a contact arm disposed in the terminal fillister. A shielding shell encloses the insulating body to define an inserting space between the shielding shell and the tongue portion. The contact arm has a front end thereof held between the holding portions to avoid curling under the action of inserting a mating connector into the inserting space.