An electric train car controlling device comprising a controlling unit that generates a target torque command value, TP, for a plurality of motors to suppress an idling state of driving wheels based on revolving speeds of the motors that drive a plurality of driving wheel axles, wherein the controlling unit comprises: a first judging unit (1, 2, 4, 5, 7) that obtains, by use of self-axle speeds that are the revolving speeds of the motors and a reference speed that is a minimum speed of the revolving speeds of the motors, a speed deviation of each of the self-axle speeds from the reference speed and an acceleration deviation, and judges a degree of the idling state of the driving wheels in accordance with how much the thus obtained speed deviation and the acceleration deviation exceed thresholds that are individually determined; a limiting process performing unit that performs a limiting process to reduce an instruction torque command value, TP", that is externally supplied, in accordance with a judgment result obtained by the first judging unit (1, 2, 4, 5, 7); a second judging unit (10, 11) that determines a first threshold that exceeds an absolute acceleration determined in accordance with a vehicle usage condition with reference to the absolute acceleration, and judges whether an acceleration of a self-axle speed that is the maximum speed selected from the revolving speeds of the motors exceeds the first threshold; and an output processing unit that outputs a torque command value, TP, processed by the limiting process performing unit as the target torque command value when a judgment result obtained by the second judging unit (10, 11) is not exceeding the first threshold, and outputs the target torque command value subjected to a reduction process that is performed regardless of a process result obtained by the limiting process performing unit when the judgment result obtained by the second judging unit (10, 11) is exceeding the first threshold, wherein, in the reduction process, the target torque command TP is gradually decreased to a predetermined minimum value. a first judging unit (1, 2, 4, 5, 7) that obtains, by use of self-axle speeds that are the revolving speeds of the motors and a reference speed that is a minimum speed of the revolving speeds of the motors, a speed deviation of each of the self-axle speeds from the reference speed and an acceleration deviation, and judges a degree of the idling state of the driving wheels in accordance with how much the thus obtained speed deviation and the acceleration deviation exceed thresholds that are individually determined; a limiting process performing unit that performs a limiting process to reduce an instruction torque command value, TP", that is externally supplied, in accordance with a judgment result obtained by the first judging unit (1, 2, 4, 5, 7); a second judging unit (10, 11) that determines a first threshold that exceeds an absolute acceleration determined in accordance with a vehicle usage condition with reference to the absolute acceleration, and judges whether an acceleration of a self-axle speed that is the maximum speed selected from the revolving speeds of the motors exceeds the first threshold; and an output processing unit that outputs a torque command value, TP, processed by the limiting process performing unit as the target torque command value when a judgment result obtained by the second judging unit (10, 11) is not exceeding the first threshold, and outputs the target torque command value subjected to a reduction process that is performed regardless of a process result obtained by the limiting process performing unit when the judgment result obtained by the second judging unit (10, 11) is exceeding the first threshold, wherein, in the reduction process, the target torque command TP is gradually decreased to a predetermined minimum value.