Abstract: A case having an inner case and an outer case combined together by means of a flange and a low wall extending rearward from the flange provided around an open front side of the inner case and a projecting ridge having a low notch in an outer end on each inner surface of four continuous sides of the outer case, the projecting wall of the flange engaging and being glued with the projecting ridges of the outer case to combine the inner and the outer case to form a complete case.