A motor controller for driving an interior permanent magnet (IPM) motor has a current feedback control unit that calculates a q-axis current restriction value based on a dq-axis voltage instruction value and a dq-axis current detection value, so that a power source current flowing in an inverter circuit is controlled to be equal to or lower than a target power source current. Provided that a torque current proportional to an output torque of the motor is defined as a torque current, a torque current converter converts the q-axis current restriction value to a torque current restriction value by using a d-axis current detection value. A torque current instruction value restrictor restricts a torque current instruction value with the torque current restriction value. A dq-axis current converter converts a post-restriction torque current instruction value to a d-axis current instruction value and a q-axis current restriction value.