To reduce a drop in voltage of electric power for an aircraft, in a facility for feeding electric power to the aircraft during parking by converting commercial electric power into electric power of 400 Hz for the aircraft.

Transformed commercial electric power is fed from a power receiving and transforming facility 2 for commercial electric power in a terminal building 1 to a pit 7 provided on a spot 6 through a cable 8 and then fed to an inverter vehicle 11. An inverter for converting commercial electric power into electric power of 400 Hz for an aircraft is loaded on the inverter vehicle 11, and converted electric power for an aircraft is fed to an aircraft A through a short secondary side cable 19. When electric power of 400 Hz is fed, a voltage drop is easily generated. However, since the secondary side cable 19 is short, a voltage drop is reduced.