To allow a switch function to be excellently maintained by eliminating a heating and melting problem of a pusher in a normal use state.

When a movable contact point 14 of a movable contact piece 11 in a normal use state is in contact with especially a first fixed contact point 6, a first contact piece support member 101 and a second contact piece support member 102 are insulated and separated, and the first contact piece support member 101 electrically conducts so that current flows only to the first contact piece supporting member 101 through the movable contact piece 11 but not to the second contact piece support member 102. Thus, thermal resistance occurring to the movable contact piece 11 occurs only between the movable contact point 14 and the first contact piece support member 101, not between the movable contact point 14 and the second contact piece support member 102. Therefore, heat occurring to the movable contact pice 11 is not transmitted to a pusher 19, and the pusher 19 cannot be melted.