PURPOSE: To decrease the number of signal lines from a print control part to a line head base sheet.

CONSTITUTION: Bleat generating resistance bodies R1-R1280 on a thermal head base sheet 11 are divided into the first blocks by 64 each and each heat generating resistance body of this each first block is respectively connected with head driving circuits 121-1220. Then, the second block is respectively formed by each heat generating resistance body connected with adjoining two head driving circuits. Each common data line M1-M10 is connected with the head driving circuit of each second block from a print control circuit provided outside of the base sheet and a common data inputting clock line DCL 1 is connected with one of the head driving circuit of each second block and a common data inputting clock line DCL 2 is connected with another head driving circuit.