Abstract: There is disclosed a thermal printer constructed with a thermal head having a plurality of heat generating sections to record a pattern on a recording sheet; a pattern memory to record pattern information for selectively driving said plurality of heat generating sections in said thermal head; an adjusting pattern device connected to the pattern memory to discriminate the pattern informations for selective driving of at least three adjacent heat generating sections out of the plurality of heat generating sections in the thermal head, and to generate adjusting pattern information which drives two heat generating sections out of the three heat generating sections; and a feeding device connected to the pattern memory and the adjusting pattern device, to feed the pattern information stored in the pattern memory and the adjusting pattern information to the thermal head.