To provide an artificial nail which can be used for a long time without exchanging a battery while mounted, and which can simply detect the physical conditions of a user by mounting the artificial nail.

The artificial nail basically has a constitution of lighting a light-emitting body (LED) 4 of an ornament part 2 by supplying a generated electric power of a thermoelectric element as a luminescence power of the ornament part 2, using the thermoelectric element 15 that detects the difference between a body temperature and an air temperature, and generates the electric power by the temperature difference.