To generate a pulse signal for highly accurately controlling pulse width.

This discharge lamp lighting control pulse generator is provided with an A/D converter 2 for performing A/D conversion on a control signal, a register 3 for setting this value, a clock generator 4, a counter 5 for counting clock signal and a comparator 6 for outputting a signal for regulating the rise time when there is coincidence in time by comparing a count value of the counter 5 with a preset value of the register. The register 3 uses a ninth bit for judging positive or negative, and uses remaining bits for comparison in the counter 5. AND circuits 8 to 11 and an OR circuit 12 are provided for outputting signals which agree with the count value of the counter 5 at one time of the positive, and the negative corresponding to the content of the ninth bit of the register 3.