The invention is provided with electromagnet block 2, in which a coil 24 is wound around an iron core 22 via spool 23 and a york 41 whose one end is fixed to one end of the iron core 22 extends to a side of a magnetic pole part 25 on the other end of the iron core 22. A hinge spring 44 is fixed to the york 41, and a movable iron piece 4 is provided rotatably while being supported by the hinge spring 44 with the other end of the york 41 as a fulcrum. The hinge spring 44 is provided with an elastic contact part 46 extending from a fixing position to the york 41 toward a side opposite to a supporting position of the movable iron piece 4. The movable iron piece 4 is integrated with a card member 65 contactable with the elastic contact part 46 before contacting the york 41, on a side opposite to a sucked part 63 across the fulcrum.