Waterproof board switch and method of manufacturing waterproof board switch

A waterproof board switch comprising:

• a print circuit board comprising a top pattern having a center contact portion and a peripheral contact portion on a front surface and a bottom pattern having a central contact terminal and a peripheral contact terminal on a rear surface;
• a bottom coverlay arranged on the rear surface of the print circuit board to insulate the rear surface of the print circuit board;
• an insulation adhesive film having a dome hole and being thermo-compression bonded to the front surface of the print circuit board;
• a metal dome inserted into the dome hole to be in contact with the top pattern;
• and
• a top coverlay coupled to the insulation adhesive film and the print circuit board so as to cover the dome hole and surround sides of the insulation adhesive film and sides of the print circuit board;
• wherein the top coverlay is thermo-compression bonded to a top surface of the insulation adhesive film, the sides of the insulation adhesive film and the sides of the print circuit board by thermo-compression bonding so as to seal a space on which the metal dome rests, thereby preventing an introduction of contaminant between the metal dome and the print circuit board.