PURPOSE:To perform color printing only by once passing thermal paper and at least trebling a printing pattern when color printing is not performed even if the heating-cooling cycle of each heat generating resistor is the same as a conventional one, by forming three lines of heat generating resistors approaching with each other in parallel to the surface of one substrate and connecting a conductor layer insulated and separated by a multilayered structure to each heat generating resistor to separately drive each heat generating resistor. CONSTITUTION:A platen 50 has an almost columnar shape and equally presses thermal paper to be printed to first-third heat generating resistors 10, 20, 30. The conductor layers 12a-12n, 13a-13n connected to the heat generating register 10 and the conductor layers 22a-22n, 23a-23n and conductor layers 32a-32n, 33a-33n connected to the heat generating resistors 20, 30 form a multilayered structure insulated and separated by insulating layers 21, 31 and the heat generating resistors 10, 20, 30 can be separately driven. Further, the heat generating resistors 10, 20, 30 are formed in positional relation so as to equally press thermal paper to be printed by a platen 50.
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