Receptacle connector and an electrical connector using the same

A receptacle connector used for an electrical connector configured to connect two circuit boards to each other, comprising:

• a housing made of an electrically-insulating synthetic resin material, and including an upper wall, a lower wall, and left and right sidewalls, the housing having a receiving space formed therein, the receiving space having an opening portion, through which a connection target is inserted, on a front side thereof;
• a plurality of contacts made of a metal material and arranged parallel to one another, the plurality of contacts including a plurality of signal line contacts and a plurality of ground contacts, and being placed with every two adjacent signal line contacts interposed between two ground contacts;
• a supporting member made of an electrically-insulating synthetic resin material, and configured to integrally support and fix thereto the plurality of contacts;
• and
• a common contact made of a conductive resin material and configured to be provided with a certain gap from each of the plurality of ground contacts to electrically connect the plurality of ground contacts;
• wherein the plurality of contacts are received in the receiving space of the housing, the plurality of contacts being integrated together by the supporting member, the common contact does not physically contact the plurality of ground contacts, and all the plurality of ground contacts among the plurality of contacts being electrically connected together by the common contact.