CARD UNIT AND CARD EDGE CONNECTOR

A card unit comprises a substrate having a card edge section in which a plurality of card edge terminals connected to an opposing connector are formed on at least one surface, and a case formed as a bottomed box shape having an accommodating section in which the substrate is accommodated and an open section provided at one end; wherein a retainer is mounted to the case so as to close up the open section, the retainer is formed as a box shape having an opening at one end and a closed section disposed inside the case at the other end, and having a core section formed shorter than the length of the case; a groove section into which the card edge section protrudes is formed in the closed section; and the card edge section is covered by the core section of the retainer.