A sealed bearing defining a bearing interior space, the sealed bearing comprising: a seal member separating the bearing interior space from a bearing exterior of the sealed bearing, the seal member including a seal lip; a seal sliding surface slidable in a circumferential direction relative to the seal lip; and a plurality of protrusions disposed on the seal lip, and defining, between the seal sliding surface and the seal lip, oil passages communicating with the bearing interior space and the bearing exterior; wherein wedge-shaped gaps are defined between the seal sliding surface and each of the protrusions of the seal lip so as to be each larger on a side of a corresponding one of the oil passages than on a side of the protrusion, and wherein the protrusions are arranged in the circumferential direction at intervals of 0.3 mm to 2.6 mm, the sealed bearing further comprising an inner race having a raceway groove; an outer race having a raceway groove; and a plurality of balls disposed between the raceway groove of the inner race and the raceway groove of the outer race; wherein the bearing interior space is defined between the inner race and the outer race, chracterized in that the inner race has, on respective sides of the raceway groove of the inner race, a pair of shoulders (412, 413) comprising a load-receiving shoulder configured to receive an axial load, and a non-load-receiving shoulder, the load-receiving shoulder being higher in height than the non-load-receiving shoulder, wherein the seal member comprises first and second seal members sealing respective ends of the bearing interior space, the first and second seal members including first and second seal lips respectively, and wherein the seal sliding surface comprises first and second seal sliding surfaces (414, 415) disposed, respectively, on the load receiving shoulder and on the non-load receiving shoulder, wherein the first seal sliding surface on the load receiving shoulder is different in diameter from the second seal sliding surface on the non-load receiving shoulder, wherein the first seal member is disposed close to the first seal sliding surface, and the second seal member is disposed close to the second seal sliding surface, wherein the plurality of protrusions comprise at least one first protrusion disposed on one circumferential portion of the first seal lip, and at least one second protrusion disposed on one circumferential portion of the second seal lip, and wherein the at least one first protrusion is different in number from the at least one second protrusion, and wherein a circumferential pitch angle with which the at least one first protrusion is arranged is different from a circumferential pitch angle with which the at least one second protrusion is arranged. a seal member separating the bearing interior space from a bearing exterior of the sealed bearing, the seal member including a seal lip; a seal sliding surface slidable in a circumferential direction relative to the seal lip; and a plurality of protrusions disposed on the seal lip, and defining, between the seal sliding surface and the seal lip, oil passages communicating with the bearing interior space and the bearing exterior; wherein wedge-shaped gaps are defined between the seal sliding surface and each of the protrusions of the seal lip so as to be each larger on a side of a corresponding one of the oil passages than on a side of the protrusion, and wherein the protrusions are arranged in the circumferential direction at intervals of 0.3 mm to 2.6 mm, the sealed bearing further comprising an inner race having a raceway groove; an outer race having a raceway groove; and a plurality of balls disposed between the raceway groove of the inner race and the raceway groove of the outer race; wherein the bearing interior space is defined between the inner race and the outer race, chracterized in that the inner race has, on respective sides of the raceway groove of the inner race, a pair of shoulders (412, 413) comprising a load-receiving shoulder configured to receive an axial load, and a non-load-receiving shoulder, the load-receiving shoulder being higher in height than the non-load-receiving shoulder, wherein the seal member comprises first and second seal members sealing respective ends of the bearing interior space, the first and second seal members including first and second seal lips respectively, and wherein the seal sliding surface comprises first and second seal sliding surfaces (414, 415) disposed, respectively, on the load receiving shoulder and on the non-load receiving shoulder, wherein the first seal sliding surface on the load receiving shoulder is different in diameter from the second seal sliding surface on the non-load receiving shoulder, wherein the first seal member is disposed close to the first seal sliding surface, and the second seal member is disposed close to the second seal sliding surface, wherein the plurality of protrusions comprise at least one first protrusion disposed on one circumferential portion of the first seal lip, and at least one second protrusion disposed on one circumferential portion of the second seal lip, and wherein the at least one first protrusion is different in number from the at least one second protrusion, and wherein a circumferential pitch angle with which the at least one first protrusion is arranged is different from a circumferential pitch angle with which the at least one second protrusion is arranged.