Abstract: According to one embodiment; a wireless power transmission system includes; an AC power source; a power transmission resonator; a power reception resonator; an AC/DC converter; a first circuit disposed between the AC power source and the power transmission resonator; and a second circuit disposed between the power reception resonator and the AC/DC converter. Parameter values of passive elements in the first and second circuits are set so that an absolute value of an inverse transfer function between an input voltage and an output voltage of a target system at a frequency of the AC voltage is equal to or less than a divided value of the AC voltage by a battery voltage while the AC voltage is increased from a first voltage value to a second voltage value, the target system comprising the first circuit, the power transmission resonator; the power reception resonator, the second circuit and the AC/DC converter.