To provide a tag tougher than a conventional one, easily hook a fingertip with the tag and to open a page, having different appearance to easily discriminate other tag.

The tag is constituted by providing a peelable and re-adhesive pressure-sensitive adhesive 2 to the back surface of one end side of a tag main body 1, and the tag main body 1 comprises a thin sheetlike plastic. Further, an anti-slip ridge 3 is formed to the surface of the expressed part 1b, which protrudes outwardly from the outer edge of a book or the like when the tag main body 1 is used, along the outer peripheral part of the tag main body 1. It is preferable to provide a pressure-sensitive adhesive layer 4 to the inside surrounded by the ridge 3 of the expressed part 1b so as to bond a photograph, a cutting of paper, a wood thin piece or the like.