To enable to restrain warping and surface sink by restraining a part with resin alone on a resin-made polar board.

With respect to the slide switch provided with the resin-made polar board 3 with fixed contacts 9, 11, 13, 15, 17 insertion-molded and a movable board supporting a movable contact and enabled to slide the movable contact against the fixed contacts 9, 11, 13, 15, 17 at a given pressure by moving along the polar board 3, a metal plate 21 is insertion-molded at a part where the fixed contacts 9, 11, 13, 15, 17 of the polar board do not exist.