A pair of open/close and current-passing movable contact pieces is supported on a movable contact terminal such that the pair is rotatable along with the reciprocation of an operating element. An open/close movable contact is mounted on the open/close movable contact piece and is rotatably biased by a spring member. A current-passing movable contact is mounted on the current-passing movable contact piece. By moving the operating element, a restriction imposed on a position of the operating element is released so that the open/close movable contact piece is rotated by a spring force of the spring member whereby the open/close movable contact is brought into pressure contact with an open/close fixed contact mounted on a fixed contact terminal. The current-passing movable contact piece is rotated by the operating element so that the current-passing movable contact is brought into pressure contact with a current-passing fixed contact mounted on the fixed contact terminal.