A push-on switch includes a first contact plate, second contact plate, spacer, movable contact, and lid. The first plate has a projection at its center and a first terminal at its end. The second plate faces a face of the first contact plate protruding the projection and has an opening at its center and a second terminal at its end. The spacer is interposed between the first second plates for bonding them together. The movable contact is dome-shaped and has a protrusion protruding downward and touches a top face of the second plate. The protrusion faces the projection of the first plate via the opening with a given space therebetween. The lid holds the movable contact and is mounted on the top face of the second plate. A push onto the movable contact reverses the movable contact downward, which allows the protrusion to touch the projection.