Push-button switch, keytop, and method of manufacturing the keytop

A push-button switch comprising:

• a fixed contact and a movable contact opposing each other, a resin film extending over said contacts, and a molded one-piece keytop supported by said resin film above said movable contact, said keytop including a keytop portion situated above said resin film, a loop-shaped retaining portion situated beneath said resin film with a center thereof being substantially coincident with a center of a lower surface of said keytop portion, and a pressing protrusion extending beyond the lower surface of said keytop portion to a location where the protrusion will cause said movable contact to move toward said fixed contact when said keytop portion is pressed, said resin film having a plurality of holes therethrough through which a portion of said keytop extends from said keytop portion to said retaining portion, the resin film being sandwiched in a water-tight state between said keytop portion and said retaining portion, said keytop portion and said resin film comprising transparent or semi-transparent resin material, and said resin film having a number, symbol or mark on a surface thereof at a location where said keytop is situated.