A control circuit of a wireless power transmitting apparatus in a wireless power transmission system for transmitting high-frequency power from the wireless power transmitting apparatus to a wireless power receiving apparatus, wherein the wireless power transmitting apparatus comprises a power transmitting antenna including a first resonant circuit including a power transmitting coil, wherein the wireless power receiving apparatus comprises a power receiving antenna including a second resonant circuit including a power receiving coil, wherein, when the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency, wherein the wireless power transmitting apparatus further comprises: a power transmitting circuit configured to generate high-frequency power at a variable frequency from input power and supply the high-frequency power to the power transmitting antenna, under control of the control circuit of the wireless power transmitting apparatus; and at least one sensor (24, 34) configured to detect an abnormal condition due to a foreign object near the power transmitting coil or the power receiving coil, characterized in that, when the power transmitting circuit (21 A) generates high-frequency power at one of the odd-mode resonance frequency and the even-mode resonance frequency, and the high-frequency power is transmitted from the wireless power transmitting apparatus to the wireless power receiving apparatus, and an abnormal condition due to a foreign object near the power transmitting coil or the power receiving coil occurs, the control circuit of the wireless power transmitting apparatus changes the frequency of the high-frequency power generated by the power transmitting circuit to the other of the odd-mode resonance frequency and the even-mode resonance frequency. a power transmitting circuit configured to generate high-frequency power at a variable frequency from input power and supply the high-frequency power to the power transmitting antenna, under control of the control circuit of the wireless power transmitting apparatus; and at least one sensor (24, 34) configured to detect an abnormal condition due to a foreign object near the power transmitting coil or the power receiving coil, characterized in that, when the power transmitting circuit (21 A) generates high-frequency power at one of the odd-mode resonance frequency and the even-mode resonance frequency, and the high-frequency power is transmitted from the wireless power transmitting apparatus to the wireless power receiving apparatus, and an abnormal condition due to a foreign object near the power transmitting coil or the power receiving coil occurs, the control circuit of the wireless power transmitting apparatus changes the frequency of the high-frequency power generated by the power transmitting circuit to the other of the odd-mode resonance frequency and the even-mode resonance frequency.