Axially-movable rotary switch

An axially-movable rotary switch, comprising:

• a hollow casing having an opening formed on its upper end and a through hole formed on its lower end and communicating with the interior of the hollow casing;
• a fixing base fixed in the hollow casing, the fixing base having a base hole and at least one positioning hole therethrough, the positioning hole being disposed adjacent to the base hole;
• a substrate fixed below the fixing base, the substrate having a plate hole and at least one electrical contact;
• and
• a knob pivotally disposed on the upper end of the hollow casing, the knob having a shaft, a shaft hole, a switching rod and an elastic piece, the shaft being disposed in the center of the knob and penetrating the base hole and the plate hole, the shaft hole passing through the shaft, the switching rod being eccentrically disposed in the vicinity of the shaft and penetrating the positioning hole, the elastic piece being disposed at the distal end of the switching rod and electrically contacting the electrical contact of the substrate.