A wireless power feeder which performs power feed to a wireless power receiver having a power receive resonance circuit including a power receive coil and a power receive capacitor, this wireless power feeder including: a power feed coil; a resonance current detector; and a control circuit; wherein the power feed coil does not substantially constitute a resonance circuit; the current detector has a detection resonance circuit including a detection coil and a detection capacitor, and detects a resonance current of the power receive resonance circuit; the winding region of the detection coil in the current detector is smaller than the winding region of the power feed coil; and the detection coil in the current detector is disposed such that the central winding axis thereof forms an angle of not less than 80° and not more than 100° with respect to magnetic field vectors generated by the power feed coil.