An electric connector includes an insulative housing of such a shape as to be engageable on a front side thereof with a mating connector, a contact group including a plurality of contacts, a shield cover for surrounding outer surfaces of the housing, and a metal shield plate for impedance matching. The contacts are arranged in a widthwise direction of the connector so as to correspond to contacts of the mating connector. Proximal ends of the contacts are held and fixed in terminal insertion holes formed in the housing and leading ends of the contacts being exposed from the terminal insertion holes. The metal shield plate has a width thereof corresponding to a lateral length of the contact group and is disposed between the shield cover and the contact group and facing the contact group.