Cable connector (1) has an insulating frame body consisting of the connector upper portion and the connector lower side (4). The connector upper portion has a top cover (2) an intermediate member (3). Each connector upper part and the connector under side accepts a cable (5, 10) that are connected to each other, to hold this. Intermediate member (3) holds the conductive connection member (6) in the connector upper part. Conductive connecting members (6) to the sharpened edge (6 '- 6' '') is provided. Sharpened blade (6 'to 6' ''), on the other hand toward the top cover (2) in the connector top side projects, on the other hand to project toward the connector under side. By combining the connector upper portion including an intermediate member (3) and the connector bottom side (4) to each other, an insulator sharpened blade (6 '- 6' '') cable core to be connected to each other penetrate to automatically pierceable twisted in the core wire.