An identification medium having a structure comprising, in the following order, as seen from the side of observation: an optical function layer comprising a cholesteric liquid crystal layer and/or a multiple film layer, each of which reflects specific colors, a separation layer that is formed on a portion of the optical function layer, a printed layer that is formed so as to cover the entire surface of a lower surface of the optical function layer, by using an opaque ink having specific colors, and a colored adhesive layer that is formed so as to cover the entire surface of a lower surface of the printed layer, wherein when an adhesive strength between the colored adhesive layer and an adherend is set to be Xa, an adhesive strength between the colored adhesive layer and the printed layer is set to be Xb, and an adhesive strength at the portion in which the separation layer is laminated between the optical function layer and the printed layer is set to be Xc, the adhesive strength of each part is set to satisfy: Xb > Xa > Xc, and when the identification medium is torn off from the adherend, the printed layer and the colored adhesive layer are removed from an area of the identification medium, at which the separation layer is formed under the optical function layer, in that - first, a portion in which the separation layer is laminated between the optical function layer and the printed layer is torn off, - and next, a portion between the colored adhesive layer and an adherend is torn off, such that the printed layer and the adhesive layer are cohered in a cohered area, absorbed in the printed layer and the adhesive layer around the cohered area respectively, thereby not remaining on the adherend. an optical function layer comprising a cholesteric liquid crystal layer and/or a multiple film layer, each of which reflects specific colors, a separation layer that is formed on a portion of the optical function layer, a printed layer that is formed so as to cover the entire surface of a lower surface of the optical function layer, by using an opaque ink having specific colors, and a colored adhesive layer that is formed so as to cover the entire surface of a lower surface of the printed layer, wherein when an adhesive strength between the colored adhesive layer and an adherend is set to be Xa, an adhesive strength between the colored adhesive layer and the printed layer is set to be Xb, and an adhesive strength at the portion in which the separation layer is laminated between the optical function layer and the printed layer is set to be Xc, the adhesive strength of each part is set to satisfy: Xb > Xa > Xc, and when the identification medium is torn off from the adherend, the printed layer and the colored adhesive layer are removed from an area of the identification medium, at which the separation layer is formed under the optical function layer, in that - first, a portion in which the separation layer is laminated between the optical function layer and the printed layer is torn off, - and next, a portion between the colored adhesive layer and an adherend is torn off, such that the printed layer and the adhesive layer are cohered in a cohered area, absorbed in the printed layer and the adhesive layer around the cohered area respectively, thereby not remaining on the adherend. - first, a portion in which the separation layer is laminated between the optical function layer and the printed layer is torn off, - and next, a portion between the colored adhesive layer and an adherend is torn off, such that the printed layer and the adhesive layer are cohered in a cohered area, absorbed in the printed layer and the adhesive layer around the cohered area respectively, thereby not remaining on the adherend.