CONTACTLESS CHARGING SYSTEM

A contactless charging system includes: a power transmission module (1) having a power transmission coil (2); and a power receiving module (3) having a power receiving coil (4) that receives power through electromagnetic induction and a secondary battery (12) charged with received power. The power receiving module includes a switching control section (13, 15) that performs switching between a power shutdown state where power supply from the secondary battery is stopped and a power supply state where power supply is permitted, and a carrier detection circuit (14) that generates a SW signal the ON/OFF of which is switched according to the presence or absence of a power receiving carrier of high-frequency power in the power receiving coil. The switching control section controls the switching to the power shutdown state when the SW signal indicates the presence of the power receiving carrier, and to the power supply state when it indicates the absence of the power receiving carrier. Since switching is made between the power shutdown state and the power supply state according to the loaded state of the power receiving module on the power transmission module, an occurrence of permitting discharge in an unused state of the set device is avoided.