Abstract: A recording medium disc storage case includes a holding plate for covering a recording side of a recording medium disc having a central hole, the holding plate having a holding portion to be removably fitted into the central hole of the disc, the holding portion having a base extending from an inner periphery of a perforation defined centrally of the holding plate, extensions extending circumferentially from the base, and projections each radially outwardly projecting from an end portion of each of the extensions, the projections having respective tips defining a circular envelope having a diameter greater than that of the central hole of the disc, and the extensions having an outer diameter such as to be fitted in the central hole of the disc.