A control apparatus for an electric railcar in which an alternating current rotating machine that drives an electric railway vehicle is controlled, the control apparatus comprising: - an inverter that exchanges power between the inverter and an alternating-current rotating machine; - a filter capacitor connected in parallel to the direct-current side of the inverter; - a filter reactor provided between the filter capacitor and an overhead line; - a voltage increase detection unit to which an overhead line voltage (Es) measured using an overhead line voltage measuring instrument is supplied, the voltage increase detection unit sensing an amount of voltage increase (Eser) occurring when the overhead line voltage (Es) goes beyond a reference voltage value and rises at a rate of increase equal to or higher than a predetermined rate; - a correction torque command value calculation unit, that includes a torque correction parameter table which determines a torque correction parameter (ΔTR) according to the amount of voltage increase (Eser), and that calculates a correction torque command value that was corrected by the torque correction parameter (ΔTR) so that a torque command value to be received from an external unit is made smaller for a predetermined time elapsing after the voltage increase detection unit has sensed an amount of voltage increase (Eser) of a predetermined range or more during regeneration operation of the inverter; and - a vector control unit that controls the inverter so that the AC rotating machine develops torque coincident with the correction torque command value; characterized in that the voltage increase detection unit has a variation removal filter that removes, from the overhead line voltage (Es), variation components thereof whose variation rate is higher than that by a time constant defined from the predetermined rate, to calculate the amount of voltage increase (Eser) by subtracting a voltage output (Eav) from the variation removal filter from the overhead line voltage (Es) of a value larger than the reference voltage value. - an inverter that exchanges power between the inverter and an alternating-current rotating machine; - a filter capacitor connected in parallel to the direct-current side of the inverter; - a filter reactor provided between the filter capacitor and an overhead line; - a voltage increase detection unit to which an overhead line voltage (Es) measured using an overhead line voltage measuring instrument is supplied, the voltage increase detection unit sensing an amount of voltage increase (Eser) occurring when the overhead line voltage (Es) goes beyond a reference voltage value and rises at a rate of increase equal to or higher than a predetermined rate; - a correction torque command value calculation unit, that includes a torque correction parameter table which determines a torque correction parameter (ΔTR) according to the amount of voltage increase (Eser), and that calculates a correction torque command value that was corrected by the torque correction parameter (ΔTR) so that a torque command value to be received from an external unit is made smaller for a predetermined time elapsing after the voltage increase detection unit has sensed an amount of voltage increase (Eser) of a predetermined range or more during regeneration operation of the inverter; and - a vector control unit that controls the inverter so that the AC rotating machine develops torque coincident with the correction torque command value;