PURPOSE: To provide a powdery ink which gives an ink sheet capable of being regenerated and reused repeatedly.

CONSTITUTION: A powdery ink of which each particle comprises a body particle 71, a conductive substance layer 72 adherent to and covering the particle 71 in such a way that the surface of the particle 71 is not exposed to the outside, and fine conductive particles 73 adherent to the layer 72 is stuck to the surface of a substrate to from an ink layer. In printing, the ink in the ink layer is transferred by heat to a material to be printed.