A split rolling bearing comprising: a split outer ring made up of a pair of split outer ring members (102a, 102b) which are each formed into a semi-cylindrical shape and which are formed into a cylindrical shape by being butted against each other at circumferential end portions; and a plurality of rolling elements which are aligned on an inner circumferential surface side of the outer ring, and a cage for holding the plurality of rolling elements so that the respective rolling elements are disposed at substantially equal intervals in a circumferential direction and having a shaft which is fitted therein, characterized in that: in a flank formed on a radially inner side edge portion of a circumferential end face of the split outer ring, a sectional shape of the flank within at least a range where the rolling elements are brought into contact is made up of an easement curve, the range extends from a mating surface which is configured by a circumferential end face of the split outer ring members (102a, 102c) facing each other to a joint point which is a boundary between each of raceway surfaces (102a1, 102b1) of the split outer ring members (102a, 102b) and the flank, and a velocity vector of the rolling elements at the joint point is changed gradually, so that the vibration and noise attributed to a drastic change in the velocity vector is suppressed. a split outer ring made up of a pair of split outer ring members (102a, 102b) which are each formed into a semi-cylindrical shape and which are formed into a cylindrical shape by being butted against each other at circumferential end portions; and a plurality of rolling elements which are aligned on an inner circumferential surface side of the outer ring, and a cage for holding the plurality of rolling elements so that the respective rolling elements are disposed at substantially equal intervals in a circumferential direction and having a shaft which is fitted therein, characterized in that: in a flank formed on a radially inner side edge portion of a circumferential end face of the split outer ring, a sectional shape of the flank within at least a range where the rolling elements are brought into contact is made up of an easement curve, the range extends from a mating surface which is configured by a circumferential end face of the split outer ring members (102a, 102c) facing each other to a joint point which is a boundary between each of raceway surfaces (102a1, 102b1) of the split outer ring members (102a, 102b) and the flank, and a velocity vector of the rolling elements at the joint point is changed gradually, so that the vibration and noise attributed to a drastic change in the velocity vector is suppressed. in a flank formed on a radially inner side edge portion of a circumferential end face of the split outer ring, a sectional shape of the flank within at least a range where the rolling elements are brought into contact is made up of an easement curve, the range extends from a mating surface which is configured by a circumferential end face of the split outer ring members (102a, 102c) facing each other to a joint point which is a boundary between each of raceway surfaces (102a1, 102b1) of the split outer ring members (102a, 102b) and the flank, and a velocity vector of the rolling elements at the joint point is changed gradually, so that the vibration and noise attributed to a drastic change in the velocity vector is suppressed.