A bearing apparatus comprising: a bearing; and a lubricating oil supply unit connected to the bearing, the bearing including an outer ring having an outer ring raceway surface at an inner circumferential surface of the outer ring, an inner ring having an inner ring raceway surface at an outer circumferential surface of the inner ring, the inner ring being disposed inwardly of the outer ring such that the inner ring raceway surface faces the outer ring raceway surface, a plurality of rolling elements in contact with the outer ring raceway surface and the inner ring raceway surface, the plurality of rolling elements being arranged side by side on an annular raceway, and a cage configured to hold the rolling elements, the lubricating oil supply unit including a retainer configured to retain lubricating oil to be supplied to inside of the bearing, a supplier configured to supply the lubricating oil from the retainer to the inside of the bearing, and a power generator configured to generate power, the supplier being operated using the power generated by the power generator, the supplier including a nozzle for supplying the lubricating oil to the inside of the bearing, a tip of the nozzle being positioned at a center side of the cage relative to an end surface of the cage in an axial direction of the bearing, a ratio of a distance from the end surface of the cage to the tip of the nozzle with respect to a width of the cage being more than 0% and not more than 20%, wherein the tip of the nozzle includes an end inclined or curved toward the outer ring side of the bearing, characterized in that an inner diameter surface of the cage has a cross sectional shape with a larger diameter as the inner diameter surface of the cage extends toward the center side from an end portion of the inner diameter surface of the cage in the axial direction of the bearing, wherein the shape of the inner diameter surface is a curved shape depressed toward the outer circumferential side of the bearing, wherein the lubricating oil supply unit is disposed at a front side of the bearing, the tip of the nozzle is disposed to face a stepped portion of the outer circumferential surface of the inner ring of the bearing, and the stepped portion is disposed at a position overlapping with the cage when viewed in the radial direction of the bearing. a bearing; and a lubricating oil supply unit connected to the bearing, the bearing including an outer ring having an outer ring raceway surface at an inner circumferential surface of the outer ring, an inner ring having an inner ring raceway surface at an outer circumferential surface of the inner ring, the inner ring being disposed inwardly of the outer ring such that the inner ring raceway surface faces the outer ring raceway surface, a plurality of rolling elements in contact with the outer ring raceway surface and the inner ring raceway surface, the plurality of rolling elements being arranged side by side on an annular raceway, and a cage configured to hold the rolling elements, an outer ring having an outer ring raceway surface at an inner circumferential surface of the outer ring, an inner ring having an inner ring raceway surface at an outer circumferential surface of the inner ring, the inner ring being disposed inwardly of the outer ring such that the inner ring raceway surface faces the outer ring raceway surface, a plurality of rolling elements in contact with the outer ring raceway surface and the inner ring raceway surface, the plurality of rolling elements being arranged side by side on an annular raceway, and a cage configured to hold the rolling elements, the lubricating oil supply unit including a retainer configured to retain lubricating oil to be supplied to inside of the bearing, a supplier configured to supply the lubricating oil from the retainer to the inside of the bearing, and a power generator configured to generate power, a retainer configured to retain lubricating oil to be supplied to inside of the bearing, a supplier configured to supply the lubricating oil from the retainer to the inside of the bearing, and a power generator configured to generate power, the supplier being operated using the power generated by the power generator, the supplier including a nozzle for supplying the lubricating oil to the inside of the bearing, a tip of the nozzle being positioned at a center side of the cage relative to an end surface of the cage in an axial direction of the bearing, a ratio of a distance from the end surface of the cage to the tip of the nozzle with respect to a width of the cage being more than 0% and not more than 20%, wherein the tip of the nozzle includes an end inclined or curved toward the outer ring side of the bearing, characterized in that an inner diameter surface of the cage has a cross sectional shape with a larger diameter as the inner diameter surface of the cage extends toward the center side from an end portion of the inner diameter surface of the cage in the axial direction of the bearing, wherein the shape of the inner diameter surface is a curved shape depressed toward the outer circumferential side of the bearing, wherein the lubricating oil supply unit is disposed at a front side of the bearing, the tip of the nozzle is disposed to face a stepped portion of the outer circumferential surface of the inner ring of the bearing, and the stepped portion is disposed at a position overlapping with the cage when viewed in the radial direction of the bearing.