To prevent chattering generation and moreover, to improve the strength.

The fourth contact 49 for a movable contact 35 has first and second U character contacts 51 and 52 formed as large one surrounding a small one, wherein each both ends are connected to the movable contact main body 45 that making U character. The first and second U character contacts 51 and 52 are moved in directions (D1 and D2 directions), that intersect the directions (E1 and E2 directions) that are the lines of the protrusions 51a and 52a in U character contact edges to switching the protrusions 51a and 52a of each U character contacts 51 and 52, by connecting to or disconnecting from fixed contacts. Both the ends of the first and second U characters 51 and 52 are connected to the movable contact body 45, and the stiffness is given for the movement to directions D1 and D2 as shown by allows.