A tapered roller bearing comprising: an outer ring having an inner circumferential surface formed with an outer ring track surface, an inner ring having an outer circumferential surface formed with an inner ring track surface, a row of tapered rollers disposed rollably between the outer ring track surface and the inner ring track surface, and a retainer made of a resin and having a plurality of pockets for holding the tapered rollers of the row of tapered rollers at a predetermined interval; and the tapered roller bearing having a contact angle not smaller than 35°; wherein the retainer includes: a large-diameter ring portion on its large-diameter side, a small-diameter ring portion on its small-diameter side, and a plurality of pillar portions provided equidistantly in a circumferential direction, connecting the large-diameter ring portion and the small-diameter ring portion; each pocket is formed by mutually opposing wall surfaces of the mutually adjacent pair of pillar portions, an inner circumferential surface of the large-diameter ring portion, and an outer circumferential surface of the small-diameter ring portion; and the pillar portion has, on the diametrically inner surface side of its large-diameter end portion, a fall-out prevention tab for preventing the tapered roller placed inside the pocket from falling onto the diametrically inner surface side; and each pillar portion has, on the diametrically inner surface side of its small-diameter end portion, a fall-out prevention tab for preventing the tapered roller placed inside the pocket from falling onto the diametrically inner surface side characterized in that the distance from the diametrically inner surface end portion on the small-diameter side of the pocket to the fall-out prevention tab is within a range of 10% through 40% of a length L of the pocket from the diametrically inner surface end portion on the small-diameter side of the pocket. an outer ring having an inner circumferential surface formed with an outer ring track surface, an inner ring having an outer circumferential surface formed with an inner ring track surface, a row of tapered rollers disposed rollably between the outer ring track surface and the inner ring track surface, and a retainer made of a resin and having a plurality of pockets for holding the tapered rollers of the row of tapered rollers at a predetermined interval; and the tapered roller bearing having a contact angle not smaller than 35°; wherein the retainer includes: a large-diameter ring portion on its large-diameter side, a small-diameter ring portion on its small-diameter side, and a plurality of pillar portions provided equidistantly in a circumferential direction, connecting the large-diameter ring portion and the small-diameter ring portion; each pocket is formed by mutually opposing wall surfaces of the mutually adjacent pair of pillar portions, an inner circumferential surface of the large-diameter ring portion, and an outer circumferential surface of the small-diameter ring portion; and the pillar portion has, on the diametrically inner surface side of its large-diameter end portion, a fall-out prevention tab for preventing the tapered roller placed inside the pocket from falling onto the diametrically inner surface side; and each pillar portion has, on the diametrically inner surface side of its small-diameter end portion, a fall-out prevention tab for preventing the tapered roller placed inside the pocket from falling onto the diametrically inner surface side characterized in that the distance from the diametrically inner surface end portion on the small-diameter side of the pocket to the fall-out prevention tab is within a range of 10% through 40% of a length L of the pocket from the diametrically inner surface end portion on the small-diameter side of the pocket.