Composite container lid with IC tag

A composite container lid which comprises an inner cap fitted onto the container mouth portion by screw engagement, an over-cap fitted onto the inner cap, and an IC tag;

• wherein
• said over-cap has a top panel and a skirt descending from the circumferential edge of the top panel;
• said inner cap has a top plate and a cylindrical wall descending from the circumferential edge of the top plate and having a thread formed in the inner surface thereof to come into screw engagement with the outer surface of the container mouth portion;
• an engaging means is provided between the inner surface of the skirt of said over-cap and the outer surface of the cylindrical wall of said inner cap to transmit the turn of the over-cap fitted onto said inner cap to said inner cap;
• and
• said IC tag is attached to said inner cap or to said over-cap in a manner that a circuit inclusive of an information transmission/reception antenna connected to an IC chip in said IC tag is broken by a motion of said over-cap relative to said inner cap caused at the time of unsealing said inner cap fitted onto the container mouth portion.