an information recording - reproducing head driving circuit for moving an information recording - reproducing head from the current position on a recording medium to a desired position while velocity - controlling the head includes a pulse motor for moving the information recording - reproducing head relative to the recording medium , a timer for counting down a count value set to take the driving timing of the pulse motor , and controller for calculating the count value on the basis of a predetermined time table and setting the count value in the timer , and generating a driving pulse to the pulse motor when the timer has counted down the count value . the controller substracts a desired value extracted from the time table from the count value set in the timer the last time to thereby accomplish the calculation of a new count value .