A filter device that is provided between an overhead line and an inverter that receives power from the overhead line, and is electrically connected to a circuit breaker of a system on a higher level than the overhead line, the filter device comprising: a first filter capacitor that is provided in parallel to a direct-current unit of the inverter between a high-potential side bus of the direct-current unit of the inverter and a low-potential side bus of the direct-current unit of the inverter; a second filter capacitor that is provided to be closer to a side of the overhead line than the first filter capacitor and that is provided in parallel to the first filter capacitor between the high-potential side bus and the low-potential side bus; a first filter reactor that is provided on the high-potential side bus between the first filter capacitor and the second filter capacitor; a second filter reactor that is provided on the high-potential side bus between the second filter capacitor and the overhead line, and is magnetically coupled to the first reactor; and a circuit disconnecting unit that is serially connected to the second filter capacitor between a connection point of the first filter reactor and the second filter reactor that are magnetically coupled to each other and the low-potential side bus; a specified-frequency bypass filter that removes a noise current of a specified frequency, in which a bypass circuit disconnecting unit, a bypass inductance element, and a bypass capacitance element are connected in series, wherein the specified-frequency bypass filter is provided between the high-potential side bus and the low-potential side bus, and is provided in parallel to the first filter capacitor and the second filter capacitor, where one end of the specified-frequency bypass filter is connected between the overhead line and the second filter reactor or between a high-potential side of the first filter capacitor and the first filter reactor and the other end of the specified-frequency bypass filter is connected to the low-potential side bus. a first filter capacitor that is provided in parallel to a direct-current unit of the inverter between a high-potential side bus of the direct-current unit of the inverter and a low-potential side bus of the direct-current unit of the inverter; a second filter capacitor that is provided to be closer to a side of the overhead line than the first filter capacitor and that is provided in parallel to the first filter capacitor between the high-potential side bus and the low-potential side bus; a first filter reactor that is provided on the high-potential side bus between the first filter capacitor and the second filter capacitor; a second filter reactor that is provided on the high-potential side bus between the second filter capacitor and the overhead line, and is magnetically coupled to the first reactor; and a circuit disconnecting unit that is serially connected to the second filter capacitor between a connection point of the first filter reactor and the second filter reactor that are magnetically coupled to each other and the low-potential side bus; a specified-frequency bypass filter that removes a noise current of a specified frequency, in which a bypass circuit disconnecting unit, a bypass inductance element, and a bypass capacitance element are connected in series, wherein the specified-frequency bypass filter is provided between the high-potential side bus and the low-potential side bus, and is provided in parallel to the first filter capacitor and the second filter capacitor, where one end of the specified-frequency bypass filter is connected between the overhead line and the second filter reactor or between a high-potential side of the first filter capacitor and the first filter reactor and the other end of the specified-frequency bypass filter is connected to the low-potential side bus.