An electric power converter comprising: a processor unit configured to output control signals; and a power module configured to convert direct-current power supplied from a driving electric power source, into alternating-current power based on the control signals, the power module including an inverter circuit in which multiple arms each having power semiconductor devices connected in series are connected in parallel, a driver circuit configured to output drive signals obtained by amplifying the control signals based on a control voltage, to the power semiconductor devices, and an abnormality detection circuit configured to execute detection of an abnormality that is a short circuit in the arms, and to output an abnormality detection signal indicating a result of the abnormality detection to the processor unit, wherein the processor unit is configured to execute detection of a predicted state that is a stage prior to occurrence of at least one of the abnormalities, and when the predicted state is not detected, the processor unit is configured to make a determination that the abnormality is not caused in the power module, wherein the abnormality detection circuit is configured to execute detection of a short circuit in the arms based on a comparison in magnitude between an inter-terminal voltage of each of the power semiconductor devices and an inter-terminal voltage abnormality determination threshold; and the processor unit is configured to execute detection of a predicted state of a short circuit in the arms based on a comparison in magnitude between an electric power supply voltage supplied from the driving electric power source and an electric power supply voltage prediction value that is lower than an electric power supply voltage abnormality determination threshold indicating that a short circuit occurs in the arms, and/or wherein the abnormality detection circuit is configured to execute detection of a short circuit in the arms based on a comparison in magnitude between an inter-terminal voltage of each of the power semiconductor devices and an inter-terminal voltage abnormality determination threshold; and the processor unit is configured to execute detection of a predicted state of a short circuit in the arms based on a comparison in magnitude between a driving current flowing through the inverter circuit and a driving current prediction value that is lower than a driving current abnormality determination threshold indicating that a short circuit occurs in the arms. a processor unit configured to output control signals; and a power module configured to convert direct-current power supplied from a driving electric power source, into alternating-current power based on the control signals, the power module including an inverter circuit in which multiple arms each having power semiconductor devices connected in series are connected in parallel, a driver circuit configured to output drive signals obtained by amplifying the control signals based on a control voltage, to the power semiconductor devices, and an abnormality detection circuit configured to execute detection of an abnormality that is a short circuit in the arms, and to output an abnormality detection signal indicating a result of the abnormality detection to the processor unit, wherein an inverter circuit in which multiple arms each having power semiconductor devices connected in series are connected in parallel, a driver circuit configured to output drive signals obtained by amplifying the control signals based on a control voltage, to the power semiconductor devices, and an abnormality detection circuit configured to execute detection of an abnormality that is a short circuit in the arms, and to output an abnormality detection signal indicating a result of the abnormality detection to the processor unit, wherein the processor unit is configured to execute detection of a predicted state that is a stage prior to occurrence of at least one of the abnormalities, and when the predicted state is not detected, the processor unit is configured to make a determination that the abnormality is not caused in the power module, wherein the abnormality detection circuit is configured to execute detection of a short circuit in the arms based on a comparison in magnitude between an inter-terminal voltage of each of the power semiconductor devices and an inter-terminal voltage abnormality determination threshold; and the processor unit is configured to execute detection of a predicted state of a short circuit in the arms based on a comparison in magnitude between an electric power supply voltage supplied from the driving electric power source and an electric power supply voltage prediction value that is lower than an electric power supply voltage abnormality determination threshold indicating that a short circuit occurs in the arms, and/or wherein the abnormality detection circuit is configured to execute detection of a short circuit in the arms based on a comparison in magnitude between an inter-terminal voltage of each of the power semiconductor devices and an inter-terminal voltage abnormality determination threshold; and the processor unit is configured to execute detection of a predicted state of a short circuit in the arms based on a comparison in magnitude between a driving current flowing through the inverter circuit and a driving current prediction value that is lower than a driving current abnormality determination threshold indicating that a short circuit occurs in the arms.