To provide a movable contact point body and a push-button switch using above capable of being down-sized with improved reliability and with a desired operation stroke secured.

The movable contact point body and the push-button switch using above are equipped with a lower end peripheral edge part 3a loaded on a fixed contact point 2, a skirt part 3b standing with a given angle from the lower end peripheral edge part 3a, and an expanding part 3c of a dome shape capable of reversing continuing to the skirt part 3b. The skirt part 3b is formed in a long sheet shape having an opening part 3d at both side surface parts by one of opposing both side surface parts notched in parallel, formed at opposing positions pinching the expanding part 3c, and also, a center of a circle structuring an outer periphery of the lower end peripheral edge part 3a and a tip part of the expanding part 3c of the dome shape continuing to the skirt part 3b are made different from each other.