To acquire a cap which can easily determine by visual inspection that the cap is opened from the state between adjacent partitioned bands when a bridge has already been broken, even in the case where the cap is mounted again on a spout after opening due to mischief and the like, because the bridges of fraudulent opening prevention bands are not broken when capping but all the bridges are broken when the cap is rotated in the cap-opening direction with a normal opening operation.SOLUTION: A fraudulent opening prevention band 3 of a cap 1 comprises four partitioned bands 7, 8 and four breakable bridges 9 for connecting these partitioned bands 7, 8. At the partitioned bands 7, 8, locking claws 10 for restricting the rotation in a cap-opening direction X by being locked to locking protrusions of a spout are provided, and when the rotation in the cap-opening direction X...

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