Patent ID: 8152008

Claim:
A bottle cap with an additive supplying structure, comprising: an additive holding unit supported in a mouth of a bottle by an upper flange, and having in a side surface of a lower portion thereof an opening for discharging the additive, the additive holding unit being open at a top thereof; an open-and-shut unit seated to be coaxial with the additive holding unit, and moving up and down to open or shut the opening; and an outer cap unit, comprising: a sealing tube placed between the open-and-shut unit and the additive holding unit, and performing a sealing function; an outer cap body supporting at a center thereof the sealing tube, and fastened to an outer portion of the mouth of the bottle through a screw-type fastening method; and a coupling part provided on an inner wall of an upper end of the sealing tube to be coupled to the open-and-shut unit, wherein a skirt, having a forgery preventing function, is integrally provided on a lower end of the outer cap body and is secured to a skirt locking ring of the bottle, and a delay hook is provided on an inner wall of the skirt and retains the skirt for a period when the opening is opened by turning the outer cap unit, thus delaying separation of the skirt.