Abstract: A wireless power transmission system includes a structure entirely surrounded by an electromagnetic wave shielding member having appropriate electrical conductivity and appropriate frequency selectivity; at least one power receiving unit; at least one power transmission unit; and at least one resonance frequency adjuster. The resonance frequency adjuster includes at least one conductive protrusion having an open end and a transmission line connected to another end of the conductive protrusion at one end of the transmission line, wherein the open end of the conductive protrusion is arranged inside the structure, and the transmission line is electrically connected to the electromagnetic wave shielding member defining a wall surface of the structure at another end not connected to the conductive protrusion.