An electrical power conversion device, comprising: an inverter circuit that is configured to output a U-phase current, a V-phase current, and a W-phase current to a motor when in use; a current sensor (3a, 3b, 3c) that is configured to detect the U-phase current, the V-phase current, and the W-phase current; and a control circuit that is configured to control the inverter circuit based on a torque command value and values detected by the current sensor (3a, 3b, 3c), so that the U-phase current, the V-phase current, and the W-phase current outputted from the inverter circuit are formed as sine waves; wherein the control circuit comprises: a current component extraction unit that is configured to, based on the values detected by the current sensor (3a, 3b, 3c), for each phase, extract current components superimposed upon the U-phase current, the V-phase current, and the W-phase current; and an AC current abnormality detection unit that is configured to detect abnormality of an AC current flowing to the motor, based on the phases of the current components for any two phases among the U-phase current, the V-phase current, and the W-phase current; and the current components are components of frequency higher than a fundamental frequency of the U-phase current, the V-phase current, and the W-phase current; characterized in that the AC current abnormality detection unit is configured to determine that there is an abnormality, if a phase difference between any two phases of the high frequency components among the U-phase current, the V-phase current, and the W-phase current is more than 120° and less than 240°. an inverter circuit that is configured to output a U-phase current, a V-phase current, and a W-phase current to a motor when in use; a current sensor (3a, 3b, 3c) that is configured to detect the U-phase current, the V-phase current, and the W-phase current; and a control circuit that is configured to control the inverter circuit based on a torque command value and values detected by the current sensor (3a, 3b, 3c), so that the U-phase current, the V-phase current, and the W-phase current outputted from the inverter circuit are formed as sine waves; wherein the control circuit comprises: a current component extraction unit that is configured to, based on the values detected by the current sensor (3a, 3b, 3c), for each phase, extract current components superimposed upon the U-phase current, the V-phase current, and the W-phase current; and an AC current abnormality detection unit that is configured to detect abnormality of an AC current flowing to the motor, based on the phases of the current components for any two phases among the U-phase current, the V-phase current, and the W-phase current; and the current components are components of frequency higher than a fundamental frequency of the U-phase current, the V-phase current, and the W-phase current; characterized in that the AC current abnormality detection unit is configured to determine that there is an abnormality, if a phase difference between any two phases of the high frequency components among the U-phase current, the V-phase current, and the W-phase current is more than 120° and less than 240°. a current component extraction unit that is configured to, based on the values detected by the current sensor (3a, 3b, 3c), for each phase, extract current components superimposed upon the U-phase current, the V-phase current, and the W-phase current; and an AC current abnormality detection unit that is configured to detect abnormality of an AC current flowing to the motor, based on the phases of the current components for any two phases among the U-phase current, the V-phase current, and the W-phase current; and the current components are components of frequency higher than a fundamental frequency of the U-phase current, the V-phase current, and the W-phase current; characterized in that the AC current abnormality detection unit is configured to determine that there is an abnormality, if a phase difference between any two phases of the high frequency components among the U-phase current, the V-phase current, and the W-phase current is more than 120° and less than 240°.