A rail-to-ground voltage suppression system for an electric railway, comprising: one or a plurality of rail-to-ground voltage acquisition devices that each acquires a rail-to-ground voltage; and a voltage control device (201, 601, 1101, 1501) that connects a rail and a ground electrode, characterized in that: the voltage control device (201, 601, 1101, 1501) includes a voltage determination unit (301, 701, 1201, 1601) that receives the rail-to-ground voltage and outputs a voltage control command value, and further includes a voltage control circuit (302, 702) that receives the voltage control command value, and controls the voltage between the rail and the ground electrode, wherein the voltage control circuit includes a variable resistor device configured to feed back the voltage between the rail and the ground electrode, and controls an actual or apparent resistance value of the variable resistor device such that the voltage between the rail and the ground electrode has the voltage control command value, wherein when the rail-to-ground voltage acquired by any of the rail-to-ground voltage acquisition devices at an installation position of the rail-to-ground voltage acquisition device deviates from an allowable range, the voltage control device (201, 601, 1101, 1501) controls the rail-to-ground voltage at the installation position of the voltage control device by connecting the rail and the ground electrode corresponding to the rail-to-ground voltage acquired by the rail-to-ground voltage acquisition device to keep the rail-to-ground voltage in the allowable range. one or a plurality of rail-to-ground voltage acquisition devices that each acquires a rail-to-ground voltage; and a voltage control device (201, 601, 1101, 1501) that connects a rail and a ground electrode, characterized in that: the voltage control device (201, 601, 1101, 1501) includes a voltage determination unit (301, 701, 1201, 1601) that receives the rail-to-ground voltage and outputs a voltage control command value, and further includes a voltage control circuit (302, 702) that receives the voltage control command value, and controls the voltage between the rail and the ground electrode, wherein the voltage control circuit includes a variable resistor device configured to feed back the voltage between the rail and the ground electrode, and controls an actual or apparent resistance value of the variable resistor device such that the voltage between the rail and the ground electrode has the voltage control command value, wherein when the rail-to-ground voltage acquired by any of the rail-to-ground voltage acquisition devices at an installation position of the rail-to-ground voltage acquisition device deviates from an allowable range, the voltage control device (201, 601, 1101, 1501) controls the rail-to-ground voltage at the installation position of the voltage control device by connecting the rail and the ground electrode corresponding to the rail-to-ground voltage acquired by the rail-to-ground voltage acquisition device to keep the rail-to-ground voltage in the allowable range. the voltage control device (201, 601, 1101, 1501) includes a voltage determination unit (301, 701, 1201, 1601) that receives the rail-to-ground voltage and outputs a voltage control command value, and further includes a voltage control circuit (302, 702) that receives the voltage control command value, and controls the voltage between the rail and the ground electrode, wherein the voltage control circuit includes a variable resistor device configured to feed back the voltage between the rail and the ground electrode, and controls an actual or apparent resistance value of the variable resistor device such that the voltage between the rail and the ground electrode has the voltage control command value, wherein when the rail-to-ground voltage acquired by any of the rail-to-ground voltage acquisition devices at an installation position of the rail-to-ground voltage acquisition device deviates from an allowable range, the voltage control device (201, 601, 1101, 1501) controls the rail-to-ground voltage at the installation position of the voltage control device by connecting the rail and the ground electrode corresponding to the rail-to-ground voltage acquired by the rail-to-ground voltage acquisition device to keep the rail-to-ground voltage in the allowable range.