PURPOSE: To allow lead wires to be arranged easily and to reduce differences among the exothermic values in each resistance portion in a thermal head which makes multipoint and simultaneous recording of a one-line width, by shortening the distances between exothermic resistance portions and common connecting wires.

CONSTITUTION: To take an example, if in one line, N=1728 dots and in exothermic elements of an adjacent group l=l1+l2=54+54=108 dots, the common connecting lines of the 1st and 3rd main groups 11W116 and 31W316 are arranged in opposite sides to each other referring to the exothermic resistance elements R1W R1728 and therefore the common connecting wires of the 2nd and 4th main groups 21W254 and 41W454 also are arranged in a like manner. As a result, the lengths of the lead wires (printed electrode) connecting each of the exothermic resistance element portions R1WR1728 and each of the common connecting wires of the 2nd and 4th main groups 21W254, 41W454 are nearly half the lengths when the common connecting wires are arranged at one side of the exothermic resistance elements.