| 摘要 |
PROBLEM TO BE SOLVED: To enable replacement of a tape unit 20 housed in a cassette case main body 32 and easily check a remaining amount of a tape T in a wining part T0. SOLUTION: On the lower face side of a rotational supporting part 21a of the tape unit 20, the winding part T0 for the tape T is set with a lower spool not to come off. A long observation window 59 extending in the radius direction of the winding part T0 and spreading visibility to the outer circumference of a winding tube is bored in the rotational supporting part 21a. A hole type supporting part 60, to which the rotational supporting part 21a is fitted tightly, is formed in a cassette lid 33 covering the upper opened face of the cassette case main body 32.
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