A capped container comprising: a cap; and a container, wherein the container has a container mouth cylindrical part, a container-side thread part formed on an outer periphery of the container mouth cylindrical part, and a container flange formed on the outer periphery of the container mouth cylindrical part below the container-side thread part, the cap has a cap body and a TE band connected to a lower end of the cap body via a weakening part, the TE band has an annular band body part connected to the lower end of the cap body and a plurality of flaps provided consecutively to a lower end of the band body part and folded back toward an inner peripheral side of the band body part, the plurality of flaps are formed along a cap circumferential direction with an interval placed therebetween, the flaps have a flap body provided consecutively to the lower end of the band body part, a flange engaging part formed on an inner peripheral side of the flap body and capable of engaging with a lower side of the container flange when the cap is attached to the container, and an attitude maintaining piece formed on an upper end side of the flap body and arranged on an outer peripheral side of the container flange when the cap is attached to the container, an inner peripheral wall of the band body part has a release part that forms a gap between an outer peripheral wall of the attitude maintaining piece and the inner peripheral wall of the band body part in a state where the cap is attached to the container, characterized in that circumferential widths of the attitude maintaining piece and the flange engaging part are formed to be narrower than a circumferential width of the flap body, the flange engaging part is formed at a central part of the flap body in a cap circumferential direction, the attitude maintaining piece is formed at each of both ends in a circumferential direction of the flap body, and the attitude maintaining piece and the flange engaging part are formed so as not to overlap each other in the circumferential direction. a cap; and a container, wherein the container has a container mouth cylindrical part, a container-side thread part formed on an outer periphery of the container mouth cylindrical part, and a container flange formed on the outer periphery of the container mouth cylindrical part below the container-side thread part, the cap has a cap body and a TE band connected to a lower end of the cap body via a weakening part, the TE band has an annular band body part connected to the lower end of the cap body and a plurality of flaps provided consecutively to a lower end of the band body part and folded back toward an inner peripheral side of the band body part, the plurality of flaps are formed along a cap circumferential direction with an interval placed therebetween, the flaps have a flap body provided consecutively to the lower end of the band body part, a flange engaging part formed on an inner peripheral side of the flap body and capable of engaging with a lower side of the container flange when the cap is attached to the container, and an attitude maintaining piece formed on an upper end side of the flap body and arranged on an outer peripheral side of the container flange when the cap is attached to the container, an inner peripheral wall of the band body part has a release part that forms a gap between an outer peripheral wall of the attitude maintaining piece and the inner peripheral wall of the band body part in a state where the cap is attached to the container, characterized in that circumferential widths of the attitude maintaining piece and the flange engaging part are formed to be narrower than a circumferential width of the flap body, the flange engaging part is formed at a central part of the flap body in a cap circumferential direction, the attitude maintaining piece is formed at each of both ends in a circumferential direction of the flap body, and the attitude maintaining piece and the flange engaging part are formed so as not to overlap each other in the circumferential direction.