<p>An actuator comprising an operating key (2) adapted to be inserted in a key insertion hole formed in a safety switch, a base (3), the operating key (2) being held by the base (3) so that the operating key (2) is swingable in two directions orthogonal to each other, and a means (for example, guide stop (4) and fitting portion (34)) for selectively regulating the swing motion of the operating key (2) in only either one of the two directions. <IMAGE></p>
