A memory card connector 10, which can be locked easily with a small size holder cover 20, includes a housing 11 for a memory card; the holder cover 20 covering the memory card; a plurality of connection terminals 14, are built into the housing so that one end is opposite a contact part of the memory card housed inside the housing and is exposed at the surface of the housing and the other end protrudes from an edge of the housing, the holder cover is supported at one side edge which is sideways with respect to the longitudinal direction of the connector, so that, by pivoting around a rotation shaft 15 provided on one side edge of the housing, the holder cover 20 can be opened and closed with respect to housing 11.