Rolling bearing device

A rolling bearing device comprising:

• a bearing portion that has a stationary ring, a rotary ring on a radially inner or outer side of the stationary ring, and a plurality of rolling elements provided between the stationary ring and the rotary ring;
• a stationary portion that is stationary together with the stationary ring;
• a rotary portion provided on a radially inner or outer side of the stationary portion so as to be rotatable together with the rotary ring;
• and
• a power generation portion that has a plurality of projecting portions provided on one of the stationary portion and the rotary portion such that the projecting portions are arranged side by side in a rotational direction of the rotary portion, a pair of core members provided on the other of the stationary portion and the rotary portion such that the core members are provided at intervals corresponding to intervals at which the projecting portions are provided, a magnet provided between the core members, and a coil wound around the core member, the power generation portion being configured to generate an induced current in the coil as the projecting portions relatively pass in a vicinity of first side end portions of the core members during rotation of the rotary portion, wherein:
• magnetism generated by the magnet flows along a first loop path that passes through the first side end portions, the projecting portions, and a center of the coil in a first state in which the projecting portions are close to the first side end portions of the core members;
• and
• magnetism generated by the magnet flows along a second loop path that passes through second side end portions of the core members and the center of the coil in a second state in which the projecting portions and the first side end portions of the core members are away from each other.