Patent ID: 8547688

Claim:
A resin overcap adapted to be fitted onto a sealing-cap mounted on a nozzle of a container, comprising: a top panel and a cylindrical side wall hanging down from a circumferential edge of the top panel and in which the sealing-cap fits; wherein a step or protrusions are formed on an upper portion on an inner surface of said cylindrical side wall to prevent an upward motion of the sealing-cap fitted in said cylindrical side wall, and a knurling is formed under the step or protrusions; an IC tag provided with an IC chip is mounted on said top panel in a manner of maintaining a predetermined distance D to a top plate of the sealing-cap fitted into said cylindrical side wall; and an outer surface of said cylindrical side wall is of a corrugated form in which concave surfaces and convex surfaces are alternately formed extending in the axial direction.