A non-contact power feeding device comprising: a power receiving element that is provided in a power receiving-side device; a power receiving circuit configured to convert AC power received by the power receiving element, to generate a motive power voltage and to output to a motive power load (61, 62), and to generate a control voltage and to output to a control load (63, 73); a power feeding element that is provided in a power feeding-side device, which is disposed facing the power receiving-side device, and configured to feed AC power in a non-contact manner by electrically coupling with the power receiving element; an AC power supply that is configured to switch a drive frequency (fD) between an operational frequency (fM) during driving of the motive power load (61, 62) and the control load (63, 73) and a standby frequency (fC) during driving of the control load (63, 73) only, and to supply AC power of the drive frequency to the power feeding element; a frequency detecting section configured to detect a power reception frequency (fR) of the AC power received by the power receiving element; a motive power shutoff section configured to shut off output of the motive power voltage when the power reception frequency (fR) is outside a predetermined frequency range that includes the operational frequency (fM) or when the power reception frequency (fR) is inside a predetermined frequency range that includes the standby frequency; and a resonance element (35, 45) that is connected to at least one of the power receiving element and the power feeding element and forms a resonance circuit, wherein the non-contact power feeding device is configured such that during the driving of the motive power load (61, 62) and the control load (63, 73) a resonance frequency of the resonance circuit matches the operational frequency (fM), characterized in that the non-contact power feeding device is further configured such that during the driving of the control load (63, 73) only, the resonance circuit has a first resonance frequency larger than the operational frequency (fM), and a second resonance frequency smaller than the operational frequency, the standby frequency (fC) being larger than the first resonance frequency. a power receiving element that is provided in a power receiving-side device; a power receiving circuit configured to convert AC power received by the power receiving element, to generate a motive power voltage and to output to a motive power load (61, 62), and to generate a control voltage and to output to a control load (63, 73); a power feeding element that is provided in a power feeding-side device, which is disposed facing the power receiving-side device, and configured to feed AC power in a non-contact manner by electrically coupling with the power receiving element; an AC power supply that is configured to switch a drive frequency (fD) between an operational frequency (fM) during driving of the motive power load (61, 62) and the control load (63, 73) and a standby frequency (fC) during driving of the control load (63, 73) only, and to supply AC power of the drive frequency to the power feeding element; a frequency detecting section configured to detect a power reception frequency (fR) of the AC power received by the power receiving element; a motive power shutoff section configured to shut off output of the motive power voltage when the power reception frequency (fR) is outside a predetermined frequency range that includes the operational frequency (fM) or when the power reception frequency (fR) is inside a predetermined frequency range that includes the standby frequency; and a resonance element (35, 45) that is connected to at least one of the power receiving element and the power feeding element and forms a resonance circuit, wherein the non-contact power feeding device is configured such that during the driving of the motive power load (61, 62) and the control load (63, 73) a resonance frequency of the resonance circuit matches the operational frequency (fM), characterized in that the non-contact power feeding device is further configured such that during the driving of the control load (63, 73) only, the resonance circuit has a first resonance frequency larger than the operational frequency (fM), and a second resonance frequency smaller than the operational frequency, the standby frequency (fC) being larger than the first resonance frequency.