To supply a series of commodities having mutually different appearances and designs at a low cost and to facilitate the assemble of the casings in casings used mainly for electric equipment.

The casing has an inner case 1A, a milky translucent outer case 1B, and a decorating sheet 19 put between the inner and outer cases 1A.1B. The outer case 1B has an opening 21 for insertion at an end and has a protrusion 40 to set a limit for the decorating sheet 19 on the inner surface of the other end. A receiving part 27 to prevent the decorating sheet 19 from coming out is placed on the outer surface of the end of the inserted decorating sheet 19 on the inner case 1A. A joining protrusion 42 and a joining dent 41 to join each other to keep the both cases 1A.1B united are made between the both the inner and outer cases 1A.1B. The decorating sheet 19 is made of a polycarbonate and has its side printed with a fluorescent ink containing metal particles.