Abstract: A switch device having a casing, an actuator swingably supported to the casing, a plurality of projections suspended down from the lower surface of the actuator for changing over a switch by pressing a plurality of switch elements arranged in the casing which has a partition plate for separating the actuator and the switch element in the casing, a plurality of operation openings perforated at the partition plate for the actuators of the switch elements, and rubber pressing gaskets which transfer movement of the actuator projections to movement of switch elements and seal the upper portion of the casing from the lower portion in which the switch elements are located. Thus, the switch device can provide high waterproofness with a simple construction.