To provide a wireless power supply system for a buckle of which a system configuration can be simplified.SOLUTION: A wireless power supply system 1 for a buckle comprises: a vehicle side device 10 which performs wireless power supply to a buckle; and a buckle side device 20 which supplies electric power, which has been wirelessly supplied from the vehicle side device 10, to the buckle, and transmits information, which has been acquired by the buckle, to the vehicle side device 10. The vehicle side device 10 has a single antenna 14 which transmits electric power to the buckle side device 20, and receives a buckle state signal from the buckle side device 20. The buckle side device 20 transmits the buckle state signal to the vehicle side device 10 so that a reception timing of the buckle state signal by the vehicle side device 10 does not conflict with a transmission timing of electric power.SELECTED DRAWING: Figure 2
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