To provide a tag enabling determination of a size and a shape within a prescribed range in accordance with usability and taste of a user.

A tag 1 is constituted by a tag unit 9 wherein perforations 7 capable of being cut off along lines including a ruled line 5 and two oblique lines 6a and 6b passing through an intersection point of a vertical line 3 and a horizontal line 4 constituting the ruled line 5 are formed, and on a back surface, a plurality of thin plate materials 2 made of paper or a resin film and forming an adhesive layer 8 are laminated on a back sheet 9a, and the tag having the adhesive layer 8 on the back surface is cut off along the perforations 7 from the thin plate material 2 in various shapes such as a square, a rectangle including a strip, an isosceles triangle, a right triangle, a trapezoid, a parallelogram, a diamond shape, an arrow shape (arrow), or a star shape in optional sizes to be used in accordance with the taste of the user.