A motor control device includes an electric power conversion circuit, an electric current detection unit, a load fluctuation detection unit, and an adjustment unit. The conversion circuit supplies AC power to a motor configured to drive a mechanism unit by converting DC power into AC power. The current detection unit detects the electric current flowing through the conversion circuit or the motor. The load fluctuation detection unit detects the periodic fluctuation of the load of the motor, based on the electric current. The adjustment unit adjusts a phase of the AC voltage of the AC power, by controlling the conversion circuit based on the fluctuation. The phase of the AC voltage has a first component that increases with respect to a magnetic pole position of the motor, and a second component that changes in synchronization with the fluctuation.