A push button includes a snap-action mechanism. The snap-action mechanism includes a magnetic bar and a mobile support. The magnetic bar is secured to a fixed body of the button. The mobile support is capable of sliding between a top position and a bottom position. In the top position, a magnetic component and the bar are magnetically affixed to one another, and an upper part of the support is moved away from the bar. In the bottom position, the magnetic component is moved away and detached from the bar. A spring is interposed between a pusher and the upper part of the support so as to accelerate movement of the magnetic component away from the bar after the magnetic component has been detached from the bar. The upper part of the support is configured to bear against the bar in the bottom position.