A phase control oscillator includes a voltage control oscillator, a phase comparator, a loop filter, and a storage unit. The loop filter is configured such that if the phase control oscillator starts operating, the loop filter outputs a control voltage based on phase difference information to the voltage control oscillator. The storage unit stores deviation information indicative of a deviation between a phase difference when the loop filter outputs the control voltage in the case where the phase control oscillator starts operating and the phase difference indicated by the phase difference information. After the loop filter outputs the control voltage in response to the phase control oscillator starting operating, the loop filter outputs the control voltage based on the phase difference information output from the phase comparator and the deviation information stored in the storage unit, to the voltage control oscillator.