Wireless power relay apparatus, wireless power repeater, wireless power transmitting system and method for transmitting wireless power

PURPOSE: A wireless power repeating device a wireless power repeater, a wireless power transmission system, and a wireless power transmission method are provided to prevent harmful effects on a human body by blocking a magnetic field generated at transmitting or receiving parts. CONSTITUTION: A wireless power repeating device(200) transmits power received from a wireless transmitting device(100) to a wireless power receiving device(300). A repeating part(210) comprises a repeating coil and a repeating capacitor for self-resonate with the wireless power transmitting device. A first shielding part(230) controls the amount of a magnetic field delivered from the repeating part to the wireless power receiving device and the amount of the magnetic field being leaked to outside. The first shielding part is formed in a cylindrical or conical spring structure. A second shielding part has a shape for accommodating the repeating part. [Reference numerals] (10) Power source;