A medium includes a base layer and a separation layer. Regions are defined along a first direction. The regions include: a first region in which a portion of the medium which is in contact with the separation layer includes opposite end portions in a second direction, and at least the opposite end portions are stickable; a second region in which a portion of the medium which is in contact with the separation layer is non-stickable; and a third region in which a portion of the medium which is in contact with the separation layer is stickable. A longest length of the first region in the second direction is less than a length of the second region or the third region in the second direction at a particular position in the first direction.