A double row ball bearing comprising: an outer ring ; an inner ring ; a plurality of first balls disposed between the outer ring and the inner ring to form a first ball row; a plurality of second balls disposed between the outer ring and the inner ring to form a second ball row having a pitch circle diameter larger than a pitch circle diameter of the first ball row; a first cage in an annular shape, the first cage having a plurality of first pockets in which the first balls are held; a second cage in annular shape, the second cage having a plurality of second pockets in which the second balls are held; and an annular portion that covers, integral with or together with the outer ring, a portion of each of the second balls held in the second pockets from a radially outside, the portion of each second ball being exposed on an outside of the second pocket and oriented radially outward; wherein the second cage includes an outer annular portion located axially outward of the second balls, and a plurality of cage bars extending axially inward from the outer annular portion; characterized in that the annular portion has such a configuration that the axial position of the axially outer end surface of the annular portion coincides at least with the axial position of the axially inner end surface of the outer annular portion , and a radial dimension (Y1) of an outer annular clearance (K1) between an outer peripheral surface of the outer annular portion and an inner peripheral surface of the annular portion is equal to or less than 20% of a radial dimension (Y0) of an annular space (K0) between the inner peripheral surface of the annular portion and an outer peripheral surface of an axial end portion of the inner ring, the axial end portion being located on the second ball side. an outer ring ; an inner ring ; a plurality of first balls disposed between the outer ring and the inner ring to form a first ball row; a plurality of second balls disposed between the outer ring and the inner ring to form a second ball row having a pitch circle diameter larger than a pitch circle diameter of the first ball row; a first cage in an annular shape, the first cage having a plurality of first pockets in which the first balls are held; a second cage in annular shape, the second cage having a plurality of second pockets in which the second balls are held; and an annular portion that covers, integral with or together with the outer ring, a portion of each of the second balls held in the second pockets from a radially outside, the portion of each second ball being exposed on an outside of the second pocket and oriented radially outward; wherein the second cage includes an outer annular portion located axially outward of the second balls, and a plurality of cage bars extending axially inward from the outer annular portion; characterized in that the annular portion has such a configuration that the axial position of the axially outer end surface of the annular portion coincides at least with the axial position of the axially inner end surface of the outer annular portion , and a radial dimension (Y1) of an outer annular clearance (K1) between an outer peripheral surface of the outer annular portion and an inner peripheral surface of the annular portion is equal to or less than 20% of a radial dimension (Y0) of an annular space (K0) between the inner peripheral surface of the annular portion and an outer peripheral surface of an axial end portion of the inner ring, the axial end portion being located on the second ball side. <EOS>