A wireless power supply system comprising: a power sending resonance coil configured to have a resonance frequency characteristic and to transmit power wirelessly; a power receiving resonance coil configured to have the same resonance frequency characteristic with the power sending resonance coil and to receive power wirelessly under a magnetic field resonance mode generated by synchronization of a resonance frequency; one or more relay resonance coils configured to have the same resonance frequency characteristic with the power sending resonance coil and the power receiving resonance coil and to relay power from the power sending resonance coil to the power receiving resonance coil wirelessly under the magnetic field resonance mode generated by synchronization of a resonance frequency with them; and a posture control apparatus configured to control at least one of the power sending resonance coil, the power receiving resonance coil and the relay resonance coil, and to change a direction of its coil axis, wherein assuming an angle at which a magnetic line extending from the power sending resonance coil and directly going through the power receiving resonance coil crosses a coil axis of the power receiving resonance coil as an crossing angle α, an angle at which a magnetic line extending from the power sending resonance coil or another relay resonance coil and going through the relay resonance coil crosses a coil axis of the relay resonance coil as an crossing angle β0, and an angle at which a magnetic line extending from the relay resonance coil and going through the power receiving resonance coil or another relay resonance coil crosses a coil axis of the power receiving resonance coil or the other relay resonance coil as an crossing angle β1, the relay resonance coil is placed so as to satisfy 0°≤ β0≤α≤90°, and 0°≤ β1≤α≤90°. a power sending resonance coil configured to have a resonance frequency characteristic and to transmit power wirelessly; a power receiving resonance coil configured to have the same resonance frequency characteristic with the power sending resonance coil and to receive power wirelessly under a magnetic field resonance mode generated by synchronization of a resonance frequency; one or more relay resonance coils configured to have the same resonance frequency characteristic with the power sending resonance coil and the power receiving resonance coil and to relay power from the power sending resonance coil to the power receiving resonance coil wirelessly under the magnetic field resonance mode generated by synchronization of a resonance frequency with them; and a posture control apparatus configured to control at least one of the power sending resonance coil, the power receiving resonance coil and the relay resonance coil, and to change a direction of its coil axis, wherein assuming an angle at which a magnetic line extending from the power sending resonance coil and directly going through the power receiving resonance coil crosses a coil axis of the power receiving resonance coil as an crossing angle α, an angle at which a magnetic line extending from the power sending resonance coil or another relay resonance coil and going through the relay resonance coil crosses a coil axis of the relay resonance coil as an crossing angle β0, and an angle at which a magnetic line extending from the relay resonance coil and going through the power receiving resonance coil or another relay resonance coil crosses a coil axis of the power receiving resonance coil or the other relay resonance coil as an crossing angle β1, the relay resonance coil is placed so as to satisfy 0°≤ β0≤α≤90°, and 0°≤ β1≤α≤90°.