Abstract: A mass produced identifier providing device with sufficiently high yield, even when forming a conductive layer pattern having an extremely small thickness/minimum area using a minimum amount of silver paste. The identifier-providing device has a conductive layer pattern formed on a rear surface of a base material as an insulator. The silver paste forming the conductive layer pattern contains only silver flakes, as silver particles, that have a particle size in a range of 3.0 to 5.0 ?m and that has a thickness of 100 nm at a largest thickness portion, while having a thickness of 50 nm at a smallest thickness portion. The conductive layer pattern is formed to have a film thickness of 10 ?m or less by laminating the silver flakes in the thickness direction. The silver flakes forming the conductive layer are in a fused state or an aggregating/cohering state at the smallest thickness portion.