| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive device which facilitates installation thereof on each of game machines and can accurately prevent fraudulence. SOLUTION: The fraudulence preventor is provided with a magnetic detector 20 for detecting changes in magnetism with a magnet and the magnetic detector 20 contains a core 21 having a flange part 21a at one end thereof. The core 21 is formed by arranging three ferrite pieces 21b in a series while an insulation film 21c is interposed between the ferrite pieces 21b thereby enabling highly accurate detection of changes in magnetism over a wider range.
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