on the contents parts 240 s 1 to 240 s 6 a first positioning means is formed at the upper and lower portions of each page s 1 to s 6 of the voice book 200 in the shape of insertion holes 220 s 1 to 220 s 6 and 222 s 1 to 222 s 6 the pages s 1 to s 6 of the voice book 200 are bound by a coil at their edges in this case the insertion holes 220 s 1 to 220 s 6 and 222 s 1 to 222 s 6 do not need to be formed through all the pages s 1 to s 6 and the first positioning means can have any construction that enables the correct positioning of the voice book for example an insertion hole can be formed only in a back page the transparent parts 210 s 1 to 210 s 6 are formed of any material that allows light to pass therethrough and generally of polyester or polypropylene the reflectors bp 1 to bp 6 are made of any material that allows light to be reflected the reflectors bp 1 to bp 6 are generally formed by printing.