| 摘要 |
A tape cassette accommodating case comprising: a case main body forming an accommodating portion of a tape cassette; a lid provided at said case main body capable of opening and closing; and a pair of hub-rotation-preventive protrusions standingly provided at said lid; said pair of hub-rotation-preventive protrusions each being composed of at least three stopper pieces radially provided to be inserted into a hub hole B; a relationship between a radius r2 of said hub hole B and a radius r1 from the center of the hub hole B to a front end of a hub claw, and respective lengths of said stopper piece a, b and c, being c<a<=b, r1<=a<r2, r1<b<=r2 and c<r1; angles of (theta)2, (theta)3 and (theta)1 made by said pieces a and b, b and c, and c and a being not multiples of 60 degrees C.; wherein 120 degrees<(theta)2<180 degrees and (theta)1+(theta)2+(theta)3=360 degrees.
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