To enable to restrain a portion only of a resin at a pole board made of the resin to restrain warp or a sink mark, in a slide switch including a pole board 3 made of a resin insert-molded with fixed contacts 9, 11, 13, 15 and 17 and a movable board supporting a movable contact and capable of sliding the movable contact relative to the fixed contacts 9, 11, 13, 15 and 17 by predetermined contact pressure by moving along the pole board 3, a metal plate 21 is insert-molded to a portion of the pole board 1 at which the fixed contacts 9, 11, 13, 15 and 17 are not present.