| 摘要 |
PROBLEM TO BE SOLVED: To provide a sensor for an anti-theft device having high reliability to theft prevention, and to provide an anti-theft device. SOLUTION: In this anti-theft device provided with an anti-theft device main body 2 for outputting a warning signal on the basis of the open/closed state of a push switch 41 configured by providing a conductive coil spring 43 that energizes so as to protrude from a head 3, the coil spring 43 is formed by making one end of a coil spring part 43a with a large diameter continue to one end of a coil spring 43b with a small diameter, is provided with a first electrode 51 allowed to abut on the other end of the coil spring part 43b with a small diameter, a second electrode 52 disposed to be allowed to abut on the other end of the coil spring part 43a with a large meter, and a third electrode 53 provided outside the coil spring 43b with a small diameter, and electrically connects the second and third electrodes 52 and 53 to the first electrode 51.
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