A wireless sensor-equipped bearing (10, 10A, 10B, 10C, 10D) comprising: an inner ring having an inner ring raceway surface on an outer peripheral surface of the inner ring; an outer ring having, on an inner peripheral surface of the outer ring, an outer ring raceway surface disposed to be opposed to the inner ring raceway surface; a rolling element disposed in a raceway formed by the inner ring raceway surface and the outer ring raceway surface; a retainer formed of an annular body, the retainer including a pocket configured to rotatably hold the rolling element, the pocket penetrating a peripheral surface of the annular body, and a plurality of the pockets being formed in a circumferential direction of the annular body; a plurality of magnets fixed between the pockets of the retainer such that an N pole and an S pole of the magnets neighbor in the circumferential direction of the annular body; a first seal configured to effect sealing between the inner ring and the outer ring at an axial one-end portion, the first seal being configured to rotate relative to the retainer; a coil fixed to a surface of the first seal, the surface of the first seal being opposed to the magnet; a second seal configured to effect sealing between the inner ring and the outer ring at an axial other-end portion; a sensor disposed on any one of the inner ring, the outer ring and the first seal; a circuit unit formed on the first seal, the circuit unit including a power supply circuit configured to supply to a power-supplied unit an electric current occurring in the coil by electromagnetic induction due to relative rotation between the magnet and the coil, an arithmetic circuit configured to calculate a detection value from detection information detected by the sensor, and a wireless circuit configured to produce a wireless signal including a calculation result by the arithmetic circuit; and an antenna configured to transmit the wireless signal, the antenna being fixed to the first seal, characterized in that through-holes extending in axial direction are formed in portions between neighboring pockets, in that the magnets are fixed in the through-holes, and in that a magnetic shield configured to magnetically shield at least the wireless circuit of the circuit unit from the magnet is provided. an inner ring having an inner ring raceway surface on an outer peripheral surface of the inner ring; an outer ring having, on an inner peripheral surface of the outer ring, an outer ring raceway surface disposed to be opposed to the inner ring raceway surface; a rolling element disposed in a raceway formed by the inner ring raceway surface and the outer ring raceway surface; a retainer formed of an annular body, the retainer including a pocket configured to rotatably hold the rolling element, the pocket penetrating a peripheral surface of the annular body, and a plurality of the pockets being formed in a circumferential direction of the annular body; a plurality of magnets fixed between the pockets of the retainer such that an N pole and an S pole of the magnets neighbor in the circumferential direction of the annular body; a first seal configured to effect sealing between the inner ring and the outer ring at an axial one-end portion, the first seal being configured to rotate relative to the retainer; a coil fixed to a surface of the first seal, the surface of the first seal being opposed to the magnet; a second seal configured to effect sealing between the inner ring and the outer ring at an axial other-end portion; a sensor disposed on any one of the inner ring, the outer ring and the first seal; a circuit unit formed on the first seal, the circuit unit including a power supply circuit configured to supply to a power-supplied unit an electric current occurring in the coil by electromagnetic induction due to relative rotation between the magnet and the coil, an arithmetic circuit configured to calculate a detection value from detection information detected by the sensor, and a wireless circuit configured to produce a wireless signal including a calculation result by the arithmetic circuit; and an antenna configured to transmit the wireless signal, the antenna being fixed to the first seal, characterized in that through-holes extending in axial direction are formed in portions between neighboring pockets, in that the magnets are fixed in the through-holes, and in that a magnetic shield configured to magnetically shield at least the wireless circuit of the circuit unit from the magnet is provided.