Switch device

A switch device comprising a casing having a bottom wall, two sets of switch elements which are incorporated into the casing, and a manipulation knob which has a pair of pushing projections for selectively operating the two sets of switch elements, the switch element including a plurality of fixed contact members which are fixed to the casing and are exposed on the bottom wall, a conductive plate which is tiltably arranged on the bottom wall and is brought into contact with and separated from at least one of the fixed contact members, a driver which is arranged above the conductive plate in a state that elevation/descending operation thereof is allowed and is rotatable about a shaft;

• and a spring member which resiliently biases the shaft of the driver toward the bottom wall, wherein
• the driver includes a portion to be pushed which is projected outside the casing in a sideward direction and is resiliently brought into contact with the pushing projection due to a biasing force of the spring member and a slide operating portion which slides on an inclined surface of the conductive plate when the portion to be pushed is pushed by the pushing projection, and
• wherein a preloaded state in which the pushing projection pushes the portion to be pushed by a fixed quantity is established at the time of mounting the manipulating knob, and wherein a contact position between the slide operating portion and the conductive plate in a non-loaded state in which the manipulating knob is not present is set such that the slide operating portion is brought into contact with a given position on the conductive plate in the preloaded state.