PURPOSE: To obtain a card being inexpensive, being difficult to falsify and enabling verification of use conditions thereof, by coating a base card with a UV-absorptive or UV-reflective material invisible in the region of visible rays, in a step other than the step of producing the base card, to provide a mark for preservation of confidential information and prevention of falsification.

CONSTITUTION: A base card 1 is formed of a thermal recording paper or ordinary paper capable of being provided with a visible print, whereas a secret mark 2 for preservation of confidential information and prevention of falsification and protective marks 3a, 3b, 3c for preventing falsification or forgery are provided by applying a UV-reflective or UV-absorptive material invisible in the region of visible rays. The falsification-preventive marks and the distances therefrom to a printing region start mark 4a are determined beforehand by software, and when a card is found conforming to the rules determined by the software, the card is judge qualified for use as a card, and thereafter a visible print of the residual amount and use conditions of the card is made in a visible printing part 5. Since the marks invisible to the eyes are printed on the visible print, falsification of the card requires matching of both a marking ink and printing positions, and it is therefore difficult to falsify the card.