the present invention relates to a board connector for electrically connecting together circuit boards which are incorporated in , for example , a mobile telephone . a dust - proof measure is carried out by swingably attaching a cover member to a plug via a fulcrum shaft , and covering contact portions of the plug and socket in a fitting state with the cover member . in one of the plug and the cover member , a protrusion which causes an end portion to continuously butt against another one of the plug and the cover member from one end to another end is disposed , whereby , when the plug is inserted , the force of inserting the plug is evenly transmitted from the cover member to the whole plug . joining portions which , when the plug and the socket are fitted to each other , are joined to each other in a front side with respect to the fulcrum shaft are disposed in the socket and the cover member . the plug is pulled up with using the cover member as a lever by swinging the cover member with setting the joining portions as a lever fulcrum .