To provide an anti-counterfeit material facilitating discrimination between true or false without using any special tool or device and having a high anti-counterfeit effect.

This thread provided with a coated layer changing its hue by changing temperature on a base member is produced. Thereby, it becomes possible to distinguish the color-changing effect of the thread with the change of temperature by viewing, and easily discriminate the true or false. By incorporating the thread in paper, it is possible to prepare the paper used for anti-counterfeit.