Contact device and its use electromagnetic switch

The present invention provides an arc extinguishing time of disconnection can be easily between the fixed contact and the movable contact of the contact device to produce an electromagnetic switch and use it. Comprising a predetermined manner to maintain fixedly disposed in spaced arc extinguishing chamber of a pair of fixed contacts (6a), (6b); and so as to be arranged with the pair of fixed contact and the movable contact separation (11) . Formed arc root movement promotion portion (12) on said movable contact (11), to promote the movement of the moving portion to promote root arc generated when breaking away from the fixed contacts of the pair of the arc root.