To sustain the spatial occupancy of a print head at a minimum level by forming a plurality of under glaze layers on an insulating substrate, forming a conductor at any part thereon and then forming heating resistors on the uppermost layer of each under glaze layer.

A plurality of under glaze layers 2 are formed on an insulating substrate 1 by printing and firing a glass material and a conductor 3 of gold is patterned at any part on the under glaze layers 2 by photolithography. Furthermore, a heating date dummy heating element 5a and a station name dummy heating element 5b are formed on the uppermost one of a plurality of under glaze layers 4. Subsequently, the heating elements 5a, 5b, respective under glaze layers 4 and the conductor 3 are covered with a protective layer 6. According to the structure, spatial occupancy of a print head can be sustained at a minimum level.