A motor controller that drives and controls a multiphase electric motor, the motor controller comprising: a plurality of motor drive circuits (32A, 32B) configured to supply multiphase motor drive current to multiphase motor windings (La, Lb, Lc) of the multiphase electric motor; a control operation device configured to drive and control the plurality of motor drive circuits (32A, 32B); a plurality of motor current cutoff units (33A, 33B) respectively arranged between the plurality of motor drive circuits (32A, 32B) and the multiphase motor windings (La, Lb, Lc); and an abnormality detection unit configured to detect an abnormality of at least one of the plurality of motor drive circuits (32A, 32B) and the plurality of multiphase electric motor, wherein in the multiphase electric motor, the multiphase motor windings (La, Lb, Lc) that are wound around a stator are respectively connected in parallel with a plurality of coil units (L1 to L3), wherein when the abnormality detection unit does not detect the abnormality, the control operation device controls the plurality of motor drive circuits (32A, 32B) to supply the multiphase motor drive current to the multiphase motor windings (La, Lb, Lc), and wherein when the abnormality detection unit detects the abnormality, the control operation device changes a drive mode of driving the plurality of motor drive circuits (32A, 32B) depending on an abnormality mode, characterized in that the abnormality detection unit detects a disconnection abnormality of at least one of the plurality of coil units (L1 to L3) included in the multiphase motor windings (La, Lb, Lc) of the multiphase electric motor, wherein when the abnormality detection unit detects the disconnection abnormality of at least one of the plurality of coil units (L1 to L3), the control operation device corrects and increases a current control gain for one of the multiphase motor windings (La, Lb, Lc) at which the disconnection abnormality occurs in order to suppress a torque change. a plurality of motor drive circuits (32A, 32B) configured to supply multiphase motor drive current to multiphase motor windings (La, Lb, Lc) of the multiphase electric motor; a control operation device configured to drive and control the plurality of motor drive circuits (32A, 32B); a plurality of motor current cutoff units (33A, 33B) respectively arranged between the plurality of motor drive circuits (32A, 32B) and the multiphase motor windings (La, Lb, Lc); and an abnormality detection unit configured to detect an abnormality of at least one of the plurality of motor drive circuits (32A, 32B) and the plurality of multiphase electric motor, wherein in the multiphase electric motor, the multiphase motor windings (La, Lb, Lc) that are wound around a stator are respectively connected in parallel with a plurality of coil units (L1 to L3), wherein when the abnormality detection unit does not detect the abnormality, the control operation device controls the plurality of motor drive circuits (32A, 32B) to supply the multiphase motor drive current to the multiphase motor windings (La, Lb, Lc), and wherein when the abnormality detection unit detects the abnormality, the control operation device changes a drive mode of driving the plurality of motor drive circuits (32A, 32B) depending on an abnormality mode, characterized in that the abnormality detection unit detects a disconnection abnormality of at least one of the plurality of coil units (L1 to L3) included in the multiphase motor windings (La, Lb, Lc) of the multiphase electric motor, wherein when the abnormality detection unit detects the disconnection abnormality of at least one of the plurality of coil units (L1 to L3), the control operation device corrects and increases a current control gain for one of the multiphase motor windings (La, Lb, Lc) at which the disconnection abnormality occurs in order to suppress a torque change.