A needle bearing comprising: a bearing ring comprising: a raceway surface at an inner peripheral surface thereof or an outer peripheral surface thereof, and a pair of flanges (11b, 11c) at both ends thereof; a plurality of needles disposed in the bearing ring to be rotatable along the raceway surface; a cage comprising a plurality of pockets for holding the plurality of needles therein; a pair of rims formed by a plurality of arc-shaped portions; and a plurality of columns through which the pair of rims are axially connected to each other; wherein the cage comprises a plurality of elastic deformation portions along a circumferential direction thereof, the plurality of elastic deformation portions being adapted to shrink or expand in the circumferential direction, characterized in that the elastic deformation portions are formed symmetrically with respect to an intermediate portion in an axial direction of the cage, that the pair of rims are formed with a plurality of cuts in the same phase in the circumferential direction between end portions of the arc-shaped portions adjacent to each other in the circumferential direction, that each of the elastic deformation portions is extended axially inward from the respective end portions of the arc-shaped portions adjacent to each other, each of the elastic deformation portions having a pair of elastic deformation pieces through which extended portions of the elastic deformation portion are connected to each other, and that an outer peripheral surface and/or an inner peripheral surface of the elastic deformation piece is tapered so as to be gradually reduced in radial thickness from the end portions of the arc-shaped portions to an axial inward end portion of the elastic deformation piece. a bearing ring comprising: a raceway surface at an inner peripheral surface thereof or an outer peripheral surface thereof, and a pair of flanges (11b, 11c) at both ends thereof; a raceway surface at an inner peripheral surface thereof or an outer peripheral surface thereof, and a pair of flanges (11b, 11c) at both ends thereof; a plurality of needles disposed in the bearing ring to be rotatable along the raceway surface; a cage comprising a plurality of pockets for holding the plurality of needles therein; a pair of rims formed by a plurality of arc-shaped portions; and a plurality of columns through which the pair of rims are axially connected to each other; wherein the cage comprises a plurality of elastic deformation portions along a circumferential direction thereof, the plurality of elastic deformation portions being adapted to shrink or expand in the circumferential direction, characterized in that the elastic deformation portions are formed symmetrically with respect to an intermediate portion in an axial direction of the cage, that the pair of rims are formed with a plurality of cuts in the same phase in the circumferential direction between end portions of the arc-shaped portions adjacent to each other in the circumferential direction, that each of the elastic deformation portions is extended axially inward from the respective end portions of the arc-shaped portions adjacent to each other, each of the elastic deformation portions having a pair of elastic deformation pieces through which extended portions of the elastic deformation portion are connected to each other, and that an outer peripheral surface and/or an inner peripheral surface of the elastic deformation piece is tapered so as to be gradually reduced in radial thickness from the end portions of the arc-shaped portions to an axial inward end portion of the elastic deformation piece.