PURPOSE: To exhibit satisfactory tamper evidence, by making intervals between lock claws or/and intervals between lock projections irregular, thereby reducing an angle at which a bridge is cut.

CONSTITUTION: Of eight lock projections, 60A and 60B, placed along a cap, the four lock projections 60B are arranged in such a way as to deviate 1-10° in the direction of uncapping, to intervals between the four remaining lock projections 60A. By twisting the cap, fitted over a container mouth 70a, in the direction of uncapping, the lock projections 60B deviating in the direction of uncapping engage with two of four lock claws 74 provided on the container mouth 70a, and the other lock projections 60A in normal positions come near to the two remaining lock claws 74. Then, bridges 55, which are near to the lock projections 60B engaging with the lock claws 74, are first cut, the cutting of another bridges 55 which are near to the other lock projections 60A is delayed by the flexion of a TE ring 58, and after the lock projections 60A engage with the lock claws 74, they are cut.