Abstract: A thermal print device comprising a plane support (1) of rectangular shape that is fitted on one of its faces, parallel to one of its longitudinally-extending edges (1a), with a resistive line (17) extending over conductor segments (14, 15) disposed perpendicularly thereto and extending alternately to one side and to the other side of the resistive line (17), one (14) of the series of segments coming from a common conductor which is constituted by a conductive layer covering the support, and in which the resistive line (17) and the conductor segments (14, 15) across which it extends are formed on an insulating layer (7) covering the conductive layer (3).