A storage case includes a frame, a top plate, and a drawer. The top plate covers an open upper side of the frame. The drawer is movable through an open front side of the frame. A bottom plate of the frame includes grooved rails and guide walls. The grooved rails are formed at left and right sides of the bottom plate. The guide walls are formed at left and right sides of the inner surface of the bottom plate so that the left and right side plates of the drawer are slidable along the guide walls. The drawer includes guide projections formed at rear left and right sides of the bottom plate. The guide projections are fitted to the grooved rails so that the guide projections are movable along the grooved rails.