Abstract: A storage case (13) is intended for a magnetic-tape cassette of a type comprising a housing (1) having a U-shaped slide (7) which is arranged on the outside of the housing (1) so as to be slidable along a bottom wall (2) with a main portion (7) and along two facing side walls (4,5) of the housing (1) with two side portions (7b,7c). The side portions (7b,7c) extend from the main portion (7a) up to substantially half the height of the side walls (4,5). In a closed position of the cassette a rear edge of the side (7) which faces a rear wall (9) of the housing (1) is spaced from the front of raised portions (2a) of the bottom wall (2) and the side walls (4,5) so that in the closed position a slot (10) is formed in the housing (1), between the front of said raised portions (2 a) and the rear edge of the slide (7) which slot extends over the entire width of the bottom and up to substantially half the height of the side walls (4,5).