A tapered roller bearing comprising: an outer ring having an outer ring raceway surface on an inner peripheral surface thereof; an inner ring having an inner ring raceway surface on an outer peripheral surface thereof; and a plurality of tapered rollers arranged in a rollable manner between the outer ring raceway surface and the inner ring raceway surface , wherein the inner ring comprises a large-diameter side and a small-diameter side, a large flange being formed on an end portion of the inner ring on the large-diameter side of the inner ring , and the inner ring raceway surface continuously extends to an end face of the inner ring on the small diameter side of the inner ring , and a contact angle α of the tapered roller bearing is 37°30' to 50°, characterized in that the tapered roller bearing further comprises a resin cage comprising a large-diameter ring portion , a small-diameter ring portion , the large-diameter ring portion and the small-diameter ring portion being spaced from each other in an axial direction, and a plurality of pillar portions connecting the large-diameter ring portion and the small-diameter ring portion to each other, thereby forming a plurality of pockets (P) to accommodate and to retain the plurality of tapered rollers , wherein the pillar portions are formed such that: in at least a part of a radially inner side of each pocket (P), an overlap width (Dw1-W1) is 0.2 mm to 0.7 mm so that an opening width W1 of each pocket (P) on the radially inner side is smaller than a diameter Dw1 of each tapered roller on a large-diameter side of each tapered roller , and in at least a part of a radially outer side of each pocket (P), an overlap width (Dw2-W2) is 0.1 mm to 0.3 mm so that an opening width W2 of each pocket (P) on the radially outer side is smaller than a diameter Dw2 of each tapered roller on a small-diameter side of each tapered roller , and a ratio between a height (D1-d)/2 of the inner ring on the large flange side and a radial cross-section thickness H of the tapered roller bearing is set such that 0.7 < (D1-d)/2H < 0.9, wherein d is an inner diameter of the tapered roller bearing and D1 is an outer diameter of the inner ring . an outer ring having an outer ring raceway surface on an inner peripheral surface thereof; an inner ring having an inner ring raceway surface on an outer peripheral surface thereof; and a plurality of tapered rollers arranged in a rollable manner between the outer ring raceway surface and the inner ring raceway surface , wherein the inner ring comprises a large-diameter side and a small-diameter side, a large flange being formed on an end portion of the inner ring on the large-diameter side of the inner ring , and the inner ring raceway surface continuously extends to an end face of the inner ring on the small diameter side of the inner ring , and a contact angle α of the tapered roller bearing is 37°30' to 50°, in at least a part of a radially inner side of each pocket (P), an overlap width (Dw1-W1) is 0.2 mm to 0.7 mm so that an opening width W1 of each pocket (P) on the radially inner side is smaller than a diameter Dw1 of each tapered roller on a large-diameter side of each tapered roller , and in at least a part of a radially outer side of each pocket (P), an overlap width (Dw2-W2) is 0.1 mm to 0.3 mm so that an opening width W2 of each pocket (P) on the radially outer side is smaller than a diameter Dw2 of each tapered roller on a small-diameter side of each tapered roller , and a ratio between a height (D1-d)/2 of the inner ring on the large flange side and a radial cross-section thickness H of the tapered roller bearing is set such that 0.7 < (D1-d)/2H < 0.9, wherein d is an inner diameter of the tapered roller bearing and D1 is an outer diameter of the inner ring . <EOS>