To prevent occurrence of stress concentration to prevent deformation of a raceway track when joining both halved bearing rings mutually.

This bearing ring 10 for the split bearing is the bearing ring for the split bearing constituted by joining two semi-cylindrical divided bearing rings 12, 14 mutually on their joining faces at both ends in the circumferential direction. Joining faces 12a, 14a on one end side in the circumferential direction of both divided bearing rings 12, 14 form projecting joining faces having such a shape that both side parts in the axial direction are symmetrical using a central part in the axial direction as a top part and curved at a predetermined curvature. Joining faces 12b, 14b on the other end side in the circumferential direction form recessed joining faces having such a shape that both side parts in the axial direction are symmetrical using a central part in the axial direction as a bottom part and curved at a smaller curvature than the curvature of the projecting joining faces.