A connector including: a header comprising a header body formed of an insulation material, and plural pairs of header posts held on both side walls of the header body; and a socket comprising a socket body formed of an insulation material and having a plug groove with which the header is engaged, and plural pairs of socket contacts held on both side walls of the plug groove of the socket body and contacted with the header posts when the header is engaged with the plug groove; the socket body is reinforced by a pair of socket reinforcing metal fittings integrally inserted into both end portions of the socket body in a longitudinal direction; each socket reinforcing metal fitting has a pair of fixed portions respectively protruding outward from lower ends of the plug groove in a widthwise direction of the side walls of the socket body and to be soldered on lands of a circuit board, and a coupling portion coupling between the fixed portions and embedded in the side wall of the socket body in the longitudinal direction; the header body is reinforced by two pairs of header reinforcing metal fittings which are embedded inboth end portions of the header body in longitudinal direction, and not electrically connected; characterized in that the two pairs of header reinforcing metal fittings are embedded with the header body by insert molding; two pairs of conductive terminals among the conductive terminals formed on a band shaped metal plate by punching work for the header post to serve as the header reinforcing metal fittings; the header reinforcing metal fittings and the header posts at a portion nearer to the header reinforcing metal fittings each are provided with a distance two or more pitches of the plural pairs of header posts formed at a constant pitch. a header comprising a header body formed of an insulation material, and plural pairs of header posts held on both side walls of the header body; and a socket comprising a socket body formed of an insulation material and having a plug groove with which the header is engaged, and plural pairs of socket contacts held on both side walls of the plug groove of the socket body and contacted with the header posts when the header is engaged with the plug groove; the socket body is reinforced by a pair of socket reinforcing metal fittings integrally inserted into both end portions of the socket body in a longitudinal direction; each socket reinforcing metal fitting has a pair of fixed portions respectively protruding outward from lower ends of the plug groove in a widthwise direction of the side walls of the socket body and to be soldered on lands of a circuit board, and a coupling portion coupling between the fixed portions and embedded in the side wall of the socket body in the longitudinal direction; the header body is reinforced by two pairs of header reinforcing metal fittings which are embedded inboth end portions of the header body in longitudinal direction, and not electrically connected; characterized in that the two pairs of header reinforcing metal fittings are embedded with the header body by insert molding; two pairs of conductive terminals among the conductive terminals formed on a band shaped metal plate by punching work for the header post to serve as the header reinforcing metal fittings; the header reinforcing metal fittings and the header posts at a portion nearer to the header reinforcing metal fittings each are provided with a distance two or more pitches of the plural pairs of header posts formed at a constant pitch.