In connection with an information transmission member-equipped external member (outer lid member) to be mounted on a container lid, the opening of the container lid and the destruction of the information transmission member are carried out by a series of operations. Upon rotational movement of an opening/closing cover (3) and an outer cover (4) relative to each other, the opening/closing cover (3) is raised to destroy a predetermined site of an IC tag (40), and a tamper-evident bottom section (38) is cut off, whereby the outer cover (4) is separated from the opening/closing cover (3), and the opening/closing cover (3) is opened sideways to make the opening/closing cover (3) detachable from the container lid.