A charging system for an electrically-powered vehicle, comprising: a power conversion facility configured to be provided between a DC power source and a system power supply; and an electrically-powered vehicle mounted with a power storage device, said power conversion facility including: an inverter for performing a bidirectional DC-AC power conversion between a first electric power line (PLb) electrically connected to said DC power source and a second electric power line (PLd); a first switch (RAC1, RAC2) connected between said first electric power line and said inverter; an isolation transformer connected between said second electric power line and said system power supply; and a connector electrically connected to said first electric power line, said electrically-powered vehicle including: a charging inlet to be electrically connected to said first electric power line by a charging cable; and a converter for converting DC power transmitted to said charging inlet into charging power for said power storage device, and said power conversion facility further including a control unit configured to close said first switch (RAC1, RAC2) and control said inverter in such a manner that causes said inverter to convert AC power from said system power supply into DC power and output the DC power to said first electric power line, or to open said first switch (RAC1, RAC2) and control said power conversion facility in such a manner that electric power from said DC powers source is output to said first electric power line (PLb) and said inverter is stopped, in a case where said power storage device is to be charged under a condition that said connector is electrically connected to said charging inlet. a power conversion facility configured to be provided between a DC power source and a system power supply; and an electrically-powered vehicle mounted with a power storage device, said power conversion facility including: an inverter for performing a bidirectional DC-AC power conversion between a first electric power line (PLb) electrically connected to said DC power source and a second electric power line (PLd); a first switch (RAC1, RAC2) connected between said first electric power line and said inverter; an isolation transformer connected between said second electric power line and said system power supply; and a connector electrically connected to said first electric power line, said electrically-powered vehicle including: a charging inlet to be electrically connected to said first electric power line by a charging cable; and a converter for converting DC power transmitted to said charging inlet into charging power for said power storage device, and an inverter for performing a bidirectional DC-AC power conversion between a first electric power line (PLb) electrically connected to said DC power source and a second electric power line (PLd); a first switch (RAC1, RAC2) connected between said first electric power line and said inverter; an isolation transformer connected between said second electric power line and said system power supply; and a connector electrically connected to said first electric power line, said electrically-powered vehicle including: a charging inlet to be electrically connected to said first electric power line by a charging cable; and a converter for converting DC power transmitted to said charging inlet into charging power for said power storage device, and a charging inlet to be electrically connected to said first electric power line by a charging cable; and a converter for converting DC power transmitted to said charging inlet into charging power for said power storage device, and said power conversion facility further including a control unit configured to close said first switch (RAC1, RAC2) and control said inverter in such a manner that causes said inverter to convert AC power from said system power supply into DC power and output the DC power to said first electric power line, or to open said first switch (RAC1, RAC2) and control said power conversion facility in such a manner that electric power from said DC powers source is output to said first electric power line (PLb) and said inverter is stopped, in a case where said power storage device is to be charged under a condition that said connector is electrically connected to said charging inlet.