To provide forgery preventing printed matters on which the stealth thermal transfer recording itself made on a material is to be transferred by using a hot-melt ink ribbon can not be observed directly, the stealthy information of which can be recognized by an infrared light detection means and the genuineness of which can be determined clearly by a simple and inexpensive method, and to provide a printing method for preventing forgery.

The forgery preventing printed matter having stealthy properties is characterized in that the stealth thermal transfer recording and a thin film are arranged on a body to be transferred. The stealth thermal transfer recording is printed by using the hot-melt ink ribbon, in which a hot-melt substance that does not absorb the exciting light of an infrared phosphor or the light emitted therefrom at the least and an infrared fluorescent substance are blended. The thin film is formed to cover the stealth thermal transfer recording and colored in a color tone visible in visible light and transmits the exciting light of the infrared phosphor. The printing method for preventing forgery is also provided.