A resin bottle cap end-ring retaining and removal structure comprising a bottle body end-ring and a ring housing portion on a bottle body, wherein: the ring housing portion is effectively configured by an indentation dip which is between a ring stopper upper flange and a ring stopper lower flange; a portion of the ring stopper upper flange opens at a guidance flange cut-out portion; the inner peripheral side of the end-ring comprises a barbed body, configured by plural tabs of barbed flaps, for preventing the end-ring from detaching, so as to contact the ring stopper upper flange and leave the end-ring at the ring housing portion; the barbed body is configured so as to be divided by a non-barbed guidance section in which a barbed body is not formed over a partial range; the guidance flange cut-out section is formed in a portion of the ring stopper upper flange; an effective guidance zone, whose dimension is the sum of a cut-out portion dimension of the guidance flange cut-out section and a non-barbed section dimension of the adjacent non-barbed guidance section, is secured by setting a removal initiation set position state in which the non-barbed guidance section and the guidance flange cut-out section are disposed adjacent to each other; and restriction of the end-ring by the ring stopper upper flange is released at the effective guidance zone, such that a removal guiding inclined orientation of the end-ring is achieved for removal initiation of the end-ring at this position, wherein an indicator, consisting of a container-side indicator and an end-ring side indicator, is formed to indicate achievement of the removal initiation set position state between the end-ring and the ring housing portion in the bottle body, when the container-side indicator and the end-ring side indicator are aligned with each other. the ring housing portion is effectively configured by an indentation dip which is between a ring stopper upper flange and a ring stopper lower flange; a portion of the ring stopper upper flange opens at a guidance flange cut-out portion; the inner peripheral side of the end-ring comprises a barbed body, configured by plural tabs of barbed flaps, for preventing the end-ring from detaching, so as to contact the ring stopper upper flange and leave the end-ring at the ring housing portion; the barbed body is configured so as to be divided by a non-barbed guidance section in which a barbed body is not formed over a partial range; the guidance flange cut-out section is formed in a portion of the ring stopper upper flange; an effective guidance zone, whose dimension is the sum of a cut-out portion dimension of the guidance flange cut-out section and a non-barbed section dimension of the adjacent non-barbed guidance section, is secured by setting a removal initiation set position state in which the non-barbed guidance section and the guidance flange cut-out section are disposed adjacent to each other; and restriction of the end-ring by the ring stopper upper flange is released at the effective guidance zone, such that a removal guiding inclined orientation of the end-ring is achieved for removal initiation of the end-ring at this position, wherein an indicator, consisting of a container-side indicator and an end-ring side indicator, is formed to indicate achievement of the removal initiation set position state between the end-ring and the ring housing portion in the bottle body, when the container-side indicator and the end-ring side indicator are aligned with each other.