Patent ID: 6938787

Claim:
A synthetic-resin screw cap, comprising: a pour-cap main body having an attaching cylinder that slides over and is fitted on a bottle mouth cylinder having a neck ring and forming a pour spout by being closely fitted; an outer cap serving as a cylindrical cap section, outer cylinder, and with a top for opening and closing the pour spout, wherein a first locking section is formed around an outer peripheral surface of the attaching cylinder; and a sealing ring is integrally connected to a lower end of an outer cylinder through a plurality of easily breakable pieces, the outer cylinder serving as a cylindrical wall section of the outer cap to be fitted on the attaching cylinder in a closed state, and the sealing ring having a second locking section to be slid over and locked with the first locking section of the pour cap main body, the second locking section being positioned between the first locking section and the neck ring when the cap section is screwed onto the pour spout, wherein a plurality of second pressing slopes is disposed on an upper end of the sealing ring so that the plurality of second pressing slopes is closely opposed to a plurality of first pressing slopes disposed at the lower end of the outer cylinder so as to slidably abut against the plurality of first pressing slopes from an unscrewing direction and at a tilt angle that is a larger acute angle than a lead angle of a helical ridge of the pour-cap main body.