A thick film thermal head includes a plurality of first and second electrodes which extend in a sub-scanning direction and are alternately arranged in a main scanning direction intersecting the sub-scanning direction at predetermined spaces. A resistance heater continuously extends in the main scanning direction across the first and second electrodes. Parts of the resistance heater between adjacent first and second electrodes form a plurality of resistance heater elements which are arranged in the main scanning direction and generate heat when energized through the first and second electrodes. The spaces between the first and second electrodes are smaller than the widths of the first and second electrodes in the main scanning direction.