A case for receiving a tape cassette having a pair of reel hubs and front openings includes a case body and a lid. The case body is made of a synthetic resin or the like material and comprises a rectangular plate-like portion and a plurality of continuous side walls extending upright from along the sides of the rectangular plate-like portion. Further, the case body is provided, on either one of the upper edges of the opposing two side walls extending along the longer sides of the rectangular plate-like portion thereof, with a tape cassette reception operating section for allowing a part of a tape-shaped recording medium projecting from the tape cassette openings to be withdrawn into the cassette. The lid is made of a metal or the like and includes a rectangular plate-like portion and a plurality of continuous side walls extending upright from along the sides of the plate-like portion. The lid closes the case body by being placed over the latter. The case body is provided with a plurality of projections on the outer surfaces of the side walls thereof so that when the case body is covered by the lid, the projections engage the inner surfaces of the side walls of the lid thereby preventing the case body from falling down.