Push switch

Abstract

A push switch includes a lower case having a recess therein, an inner and outer fixed contacts exposing from a bottom of the recess, a movable contact accommodated in the recess, an upper case attached to the lower case, an elastic operation body for sealing the recess of the lower case, and a push button provided on the elastic operation body. The movable contact has a dome shape having a concave surface facing the inner fixed contact by a distance, a convex surface opposite to the concave surface, and an outer peripheral end placed on the outer fixed contact. The upper case has a through-hole located above the recess of the lower case. The has a lower surface contacting the convex surface of the movable contact, an upper surface opposite to the lower surface, and an outer edge held between the upper case and the lower case while being compressed. The push button is inserted into the through-hole of the upper case movably. This push switch prevents dust from entering in the switch and operates reliably.