To provide a tapered roller bearing which can maintain an excellent lubrication condition between a roller edge and a large flange face with a slip between a roller and an inner/outer ring being kept minimum.

The tapered roller bearing 10 is at least configured so that a raceway surface of an outer ring 12 is formed in curvature as such that the line contact length of a rolling contact surface of roller 15 with the large flange 13 side portion with respect to the center in the axial direction becomes longer than the line contact length with the opposite side portion of the large flange side with respect to the center in the axial direction, or a raceway surface of an inner ring 11 is formed in curvature so that the line contact length of the rolling contact surface of rollers 15 with the opposite side portion of the large flange side with respect to the center in the axial direction becomes longer than the line contact length with the large flange 13 side portion with respect to the center in the axial direction.