In a brushless motor control device, a microcontroller determines a current-on phase of a motor based on zero crossing detected by a position detection circuit, and the inverter circuit generates a voltage for current-on to the determined current-on phase. In a case in which zero crossing has been successively detected plural times, in a phase that was switched from the current-on phase to a current-off phase, in a PWM control cycle after a predetermined masking period, the microcontroller controls to interrupt current to coils of all phases of the motor body. In a state in which current-on has been interrupted, the microcontroller determines the current-on phase based on zero crossing detected in one of the three phases, the inverter circuit generates the voltage for current-on for the determined current-on phase and restarts current-on to the coils.