No flicker is displayed on the display screen during display of moving pictures and power consumption can be reduced by adding a high quality moving picture display function. The nailing machine includes a nose having a nose hole in which the nail is supplied, and the driver blade made of metal. The central axis of the front pivot shaft is inclined relative to the central axis of the rear pivot shaft in a toe-in direction of the wheel. L-set product and sum computation circuits subject the frequency data of bits into L-set K-bit data in which a start bit is shifted by one bit each other.