| 摘要 |
PROBLEM TO BE SOLVED: To prevent incorrect insertion of a button battery 25 in an electric device, which the button battery 25 is installed by being inserted into a battery insertion part 26b of a battery lid 26 attached, for example, to a cassette lid part. SOLUTION: Providing projected peripheral parts 33a and 33b in an insertion opening side of the battery insertion part 26b of the battery lid 26, and fitting the insertion opening side with the form of the button battery 25, the button battery 25 is prevented from being inserting even if it is tried to insert it in revere direction.
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