Moisture-proof rotary switch structure and method for manufacturing the same

A method for manufacturing a moisture-proof rotary switch structure, comprising:

• making a casing unit by a mold unit, wherein the casing unit has a casing, a first opening formed on one part of a top surface of the casing and a second opening formed on a bottom side of the casing, the other part of the top surface of the casing is sealed, and the mold unit has an inner inclined pin in order to selectably hook an inner portion of the casing or separate the casing from the mold unit;
• disposing a rotary unit in the casing, wherein the rotary unit has a rotary body and a conductive piece disposed around the rotary body, and the rotary body has a top portion passing through the first opening and being exposed above the casing;
• and
• disposing a substrate unit on the bottom side of the casing for sealing the second opening, wherein the substrate unit has a substrate and a plurality of conductive areas formed on a top surface of the substrate, so that the conductive piece is selectably electrically connected between two of the conductive areas.