| 摘要 |
PROBLEM TO BE SOLVED: To provide a pinonreel which can be fixed to a pinonreel holder and to prevent the pinonreel from falling off from the pinonreel holder. SOLUTION: In this pinonreel 10 which is a pinonreel 10 having a pair of facing surfaces and in which each of a pair of the surfaces is provided with a retention recessed part 4 for holding the pinonreel 10 by engaging the recessed part with the projected part of the pinonreel holder, the circumference of the retention recessed part 4 is provided with a fall preventing recessed part 5 having a crosssectional area larger than that of the retention recessed part 4 to give the pinonreel 10.
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