A power transmitting apparatus that wirelessly transmits power to a power receiving apparatus , the power transmitting apparatus comprising: power transmission means for performing wireless power transmission to a power receiving apparatus arranged within a predetermined power transmission range; storage means for storing an initial impedance value that is an output impedance value of the power transmission means in a state where no object is present within the predetermined power transmission range; detection means for detecting the output impedance of the power transmission means when a predetermined detection signal has been transmitted by the power transmission means ; and determination means for, in a case where the initial impedance value and the output impedance value detected by the detection means do not match and there is no change in the output impedance value between before and after the transmission of the predetermined detection signal, determining that foreign substance is present within the predetermined power transmission range, and, in a case where the initial impedance value and the output impedance value detected by the detection means do not match and there is a change in the output impedance value between before and after the transmission of the predetermined detection signal, determining that a power receiving apparatus is present within the predetermined power transmission range, characterised in that the predetermined detection signal includes a signal for causing said power receiving apparatus to change an impedance of said power receiving apparatus in order to suppress an influence on a detection of an output impedance of said power transmission means by said detection means . power transmission means for performing wireless power transmission to a power receiving apparatus arranged within a predetermined power transmission range; storage means for storing an initial impedance value that is an output impedance value of the power transmission means in a state where no object is present within the predetermined power transmission range; detection means for detecting the output impedance of the power transmission means when a predetermined detection signal has been transmitted by the power transmission means ; and determination means for, in a case where the initial impedance value and the output impedance value detected by the detection means do not match and there is no change in the output impedance value between before and after the transmission of the predetermined detection signal, determining that foreign substance is present within the predetermined power transmission range, and, in a case where the initial impedance value and the output impedance value detected by the detection means do not match and there is a change in the output impedance value between before and after the transmission of the predetermined detection signal, determining that a power receiving apparatus is present within the predetermined power transmission range, characterised in that the predetermined detection signal includes a signal for causing said power receiving apparatus to change an impedance of said power receiving apparatus in order to suppress an influence on a detection of an output impedance of said power transmission means by said detection means . <EOS>