DURING-TRAVEL POWER FEEDING SYSTEM

An in-motion power supply system (10) includes: a power receiving unit (30) that is included in an automated transport vehicle (50) and includes a power receiving coil (L2), a power-receiving-side resonant capacitor (C2) that resonates with the power receiving coil (L2), and a rectifier circuit (32) as an AC-DC converter; and a power supply unit (20) that is connected to a direct-current power supply and includes a high-frequency inverter (22) including a power supply coil (L1) that is magnetically coupled to the power receiving coil (L2) when the automated transport vehicle (50) approaches, a switching element (SW) connected in series with the power supply coil (L1), and a power-supply-side resonant capacitor (C1) that resonates with the power supply coil (L1). The power supply unit (20) wirelessly supplies electric power to the power receiving unit (30) while the automated transport vehicle (50) is in motion.