Abstract: A connector, even when miniaturized, can reliably prevent incorrect insertion of the connector plug with respect to the connector socket and that has no risk of breaking the inner insulated housing and the like when an outside force is applied during insertion, the connector including a connector socket 2, having a shield case 4, which is a metal plate bent and formed into a rectangular tube, and an insulating housing 6, which supports a plurality of contact pins 5 and is built into the interior of shield case 4, a connector plug 3, having a plug part 3a which is inserted into an insertion opening 11 of connector socket 2; a pair of L-shaped depression parts 16, where both lower corners of shield case 4 are indented towards insertion opening 11.