| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of components and to prevent water from being infiltrated from a surrounding of a lock button. SOLUTION: A support shaft 14c of a lock button 14 having a leaf spring 14b is engaged with a notch groove 13a of a case 13, a rib 14a of the lock button is supported by a stopper 13b of the case and fitted to the case. In the case of attaching a secondary battery 10 to the case, a taper part 11a of a boss 11 provided in the secondary battery is abutted on the hook 14a of the lock button and the lock button 14 is turned in a direction of the arrow A (Figure A). When the secondary battery is placed at a prescribed position, the lock button 14 is turned in the direction of the arrow B by the elastic force of the leaf spring 14b, and the hook part locks a plane part 11b of the boss 12 (Figure B). In the case of detaching the secondary battery 10 from the case, a recessed part 14e of the lock button is depressed to turn the lock button in the direction of the arrow A and then the lock is released (Figure C).
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