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 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, an overlap width (Dw1-W1) is 0.2 mm to 0.7 mm so that an opening width W1 of each pocket 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, an overlap width (Dw2-W2) is 0.1 mm to 0.3 mm so that an opening width W2 of each pocket 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, an overlap width (Dw1-W1) is 0.2 mm to 0.7 mm so that an opening width W1 of each pocket 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, an overlap width (Dw2-W2) is 0.1 mm to 0.3 mm so that an opening width W2 of each pocket 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.