PURPOSE: To regulate the movement of an opened bottom part of an actuator through a reinforced wall, so as to increase tactile click by abutting at least inner side surface of a pair of the reinforced walls hung from a housing plate, on the gutter-shaped or tubed actuator.

CONSTITUTION: A gutter-shaped rubber actuator 5 or a tube rubber actuator 6 is installed between a push button 2 held by a housing plate 1 and a switch element 3, and the inner side surface of a pair of reinforced walls 7 hung from the housing plate 1 is abutted on the side of the rubber actuator 5 or 6. When the push button 2 is pushed in the push button switch, the bottom part of the rubber actuator 5 or 6 is to be swollen to the outside, however, since the movement of the bottom part of the rubber actuator 5 or 6 is regulated by the reinforced wall 7 the shoulder part of the actuator alone is deformed. The tactile click thus becomes equivalent to that of the cap-shaped rubber actuator.