In the breaker device, a pair of stationary electrodes 20, 21 are arranged on the front and the rear side of the protruding wall 18, that is, the pair of stationary electrodes 20, 21 are collected at one place. Therefore, the pair of stationary electrodes 20, 21 have a space round both the stationary electrodes in common. Accordingly, the size of the breaker device can be reduced. Further, when the radius of curvature of the continuity section 73 connecting the pinching pieces 71, 72 is made large, concentration of stress in the movable electrode 70 can be relieved. Therefore, the pinching forces of both the pinching pieces 71, 72 can be increased. Accordingly, it is possible to ensure a sufficiently high contact pressure between the movable electrode 70 and the stationary electrodes 20, 21.