To reduce the size of a seal for the purpose of facilitating convenience of carry and reduce the thickness of the seal to an ultrathin thickness for the purpose of facilitating use.

A hanging implement 3 is connected to the rear surface 2a of the body 2 of the ultrathin seal with a cap 1. When the seal is impressed, the cap 1 is removed, the body 2 is inked with a vermillion inkpad A and the seal is impressed with holding the hanging implement 3 with the fingers without holding the body 2. Alternatively, both the body 2 and the cap 1 are joined by a hanging implement 3b, or are individually suspended with the hanging implement 3b. Two cavities are aligned in parallel in a case 6, the vermillion inkpad Aa is packed in one side vermilion inkpad cavity 8, the body 2 is detachably and properly firmly inserted into the other seal cavity 9, and the cap 1 is detachably and properly firmly fitted with the vermillion inkpad Aa as the cover of the inkpad A.