WIRELESS POWER SUPPLY DEVICE, TELEMETRIC MEASURING SYSTEM, ROTATING MACHINE, SYSTEM FOR SUPPLYING POWER WIRELESSLY TO ROTATING BODY, AND TURBINE SYSTEM

A wireless power supply device that wirelessly supplies power from a stator side to a plurality of power-receiving antennas disposed on a rotor rotated about an axis () at intervals in a circumferential direction includes: an oscillator () that oscillates a high-frequency signal; and an annular power transmitter () that has a leaky waveguide () in which a plurality of radiating portions () that radiate the high-frequency signal as a radio wave are arranged in the circumferential direction and extend in a circular arc shape in the circumferential direction.