A motor control device for controlling a current and an applied voltage supplied from a power supply for a motor including a plurality of systems of winding sets (15, 16) each including windings of a plurality of phases, comprising: inverters (22A, 22B) of the plurality of systems comprising a plurality of switching elements (UP, UN, VP, VN, WP, WN) for controlling applied voltages to the plurality of respective phases of the winding sets (15, 16) of the plurality of systems, for controlling currents to be supplied from the power supply to the plurality of respective phases of the winding sets (15, 16) of the plurality of systems; current control means for generating a plurality of sets of voltage commands corresponding to the applied voltages to the respective inverters (22A, 22B) of the plurality of systems in accordance with a plurality of sets of current commands corresponding to the currents to be supplied to the plurality of respective phases of the winding sets (15, 16) of the plurality of systems so as to control the currents to flow through the plurality of respective phases of the winding sets (15, 16) of the plurality of systems; and fault detecting means for detecting disconnection of a wiring of any one of the plurality of respective phases of the winding sets (15, 16) of the plurality of systems or the inverters (22A, 22B) of the plurality of systems or an open fault of any one of the plurality of switching elements (UP, UN, VP, VN, WP, WN), characterized in that the fault detecting means is configured to: perform abnormality doubt determining processing for determining which system in which there is a doubt about abnormality among the plurality of systems respectively including the inverters (22A, 22B) of the plurality of systems and the winding sets (15, 16) of the plurality of systems; and determine that an open-state fault in a target phase is occurred, when it is determined that there is a doubt about abnormality and when a state in which a phase current of the target phase is equal to or lower than a predetermined current is detected over a predetermined time period or longer. inverters (22A, 22B) of the plurality of systems comprising a plurality of switching elements (UP, UN, VP, VN, WP, WN) for controlling applied voltages to the plurality of respective phases of the winding sets (15, 16) of the plurality of systems, for controlling currents to be supplied from the power supply to the plurality of respective phases of the winding sets (15, 16) of the plurality of systems; current control means for generating a plurality of sets of voltage commands corresponding to the applied voltages to the respective inverters (22A, 22B) of the plurality of systems in accordance with a plurality of sets of current commands corresponding to the currents to be supplied to the plurality of respective phases of the winding sets (15, 16) of the plurality of systems so as to control the currents to flow through the plurality of respective phases of the winding sets (15, 16) of the plurality of systems; and fault detecting means for detecting disconnection of a wiring of any one of the plurality of respective phases of the winding sets (15, 16) of the plurality of systems or the inverters (22A, 22B) of the plurality of systems or an open fault of any one of the plurality of switching elements (UP, UN, VP, VN, WP, WN), characterized in that the fault detecting means is configured to: perform abnormality doubt determining processing for determining which system in which there is a doubt about abnormality among the plurality of systems respectively including the inverters (22A, 22B) of the plurality of systems and the winding sets (15, 16) of the plurality of systems; and determine that an open-state fault in a target phase is occurred, when it is determined that there is a doubt about abnormality and when a state in which a phase current of the target phase is equal to or lower than a predetermined current is detected over a predetermined time period or longer. perform abnormality doubt determining processing for determining which system in which there is a doubt about abnormality among the plurality of systems respectively including the inverters (22A, 22B) of the plurality of systems and the winding sets (15, 16) of the plurality of systems; and determine that an open-state fault in a target phase is occurred, when it is determined that there is a doubt about abnormality and when a state in which a phase current of the target phase is equal to or lower than a predetermined current is detected over a predetermined time period or longer.