To provide a security card of which forgery is extremely difficult by providing a thermocouple in a card base material.

The security card 1 has a card base material 2 and 1st and 2nd thermocouples 3, 4. The 1st and 2nd thermocouples 3, 4 are copper- constantan thermocouples. The card base material 2 is composed of a plastic plate 21 and resin 22 covering the upper surface of this plastic plate. Therefore, the resin 22 is laminated through molding onto the upper surface of the plastic plate 21 forming the 1st and 2nd thermocouples 3, 4 so that the card base material 2 can be constituted. Besides, the 1st and 2nd thermocouples 3, 4 are embedded in the card base material 2. Further, 1st and 2nd electrodes 31 and 32 and 3rd and 4th electrodes 41 and 42 are formed on the side face of the card base material 2 so that the security card 1 can be provided. Thus, since the thermocouples 3, 4 are provided inside the card base material 2, they are hardly known.