Bearing device and electric vertical take-off and landing aircraft

A bearing device comprising:

• a bearing that includes an outer ring, an inner ring disposed on a radially inside of the outer ring, a plurality of rolling elements rollably disposed in an annular space between the outer ring and the inner ring, a retainer that holds the plurality of rolling elements at intervals in a circumferential direction, and a first seal and a second seal that seal the annular space by sandwiching the retainer with the first seal and the second seal;
• a magnetic ring that is supported by the retainer and has N poles and S poles alternately arranged;
• a stator that is supported by the first seal and has a coil opposite to the magnetic ring;
• at least one sensor that is supported by the second seal and detects a physical property of the bearing;
• a wireless communication circuit that is supported by the second seal and wirelessly transmits output of the at least one sensor to the outside;
• a power supply circuit that is supported by the second seal and supplies DC power generated by performing rectification processing of power generated by a generator including the magnetic ring and the stator to the at least one sensor and the wireless communication circuit;
• and
• a wire that electrically connects the coil and the power supply circuit,
• wherein the wire is disposed in a first groove provided on either an outer peripheral surface of the outer ring or an inner peripheral surface of the inner ring.