| 摘要 |
An upper half 11 of a tape cassette BB is made by at least a material having high transparency. Right and left holes 18 a and 18 b for light path are formed on side surfaces of the upper half 11 . Further, roughened surfaces 10 a and 10 b in a prismatic shape are formed on outer right and left sides 11 A 1 and 11 B 1 or inner right and left sides 11 A 2 and 11 B 2 of the upper half 11 in neighboring areas of or adjacent to the right and left holes 18 a and 18 b.
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