A molded product for an operation panel 1 is produced by injection molding or the like. A set of characters 7 indicative of the type of each operation switch 17 is formed, by a screen printing process, at a location near to the subject switch opening portions 6. Next, another screen printing process is executed to form a set of Braille dots 12 indicative of each set of characters 7 at a location overlapping the subject set of characters 7. Accordingly, sticking spaces which are required in the case of sticking seals of the Braille dots 12 are unnecessary any more. The Braille dots 12 can be arranged freely in a narrow space. Even though the surface 3 of the operation panel 1 is curved, it is ensured that the Braille dots 12 be arranged in a secured layout, unlike the case of sticking a Braille tape on the surface 3.