A tapered roller bearing comprising: an outer ring including an outer-ring raceway surface around an inner circumferential surface; an inner ring arranged on a radially inner side relative to the outer ring, the inner ring including an inner-ring raceway surface around an outer circumferential surface; a plurality of tapered rollers disposed between the outer-ring raceway surface and the inner-ring raceway surface, the tapered roller including a rolling surface in contact with the outer-ring raceway surface and the inner-ring raceway surface; and a cage including a plurality of pockets arranged at prescribed intervals in a circumferential direction, the cage accommodating and holding the plurality of tapered rollers in the plurality of pockets, the cage including a smaller annular portion continuous on a smaller-diameter end face side of the tapered roller, a larger annular portion continuous on a larger-diameter end face side of the tapered roller, and a plurality of posts that couple the annular portions to each other, the plurality of tapered rollers including a nitrogen enriched layer formed on a surface layer of the rolling surface, a distance from an outermost surface of the surface layer to a bottom of the nitrogen enriched layer being not shorter than 0.2 mm, wherein in each tapered roller of the plurality of tapered rollers, T2 is smaller than T1 and T2 is smaller than T3, where T1 represents a distance at a first measurement point which is a boundary point between a chamfered portion (21, 25) of the tapered roller and a crowned portion (22, 24) where crowning is formed in the rolling surface of the tapered roller, T2 represents a distance at a second measurement point which is a position at a distance of 1.5 mm from a smaller end face of the tapered roller, and T3 represents a distance at a third measurement point at a center of the rolling surface of the tapered roller, wherein T1, T2 and T3 are values of depth of the nitrogen-enriched layer at the specified measurement points and a distance from the outermost surface of the nitrogen-enriched layer to the bottom of the nitrogen-enriched layer, and wherein a nitrogen concentration in the nitrogen enriched layer is not lower than 0.1 mass % at a position of depth of 0.05 mm from the outermost surface. an outer ring including an outer-ring raceway surface around an inner circumferential surface; an inner ring arranged on a radially inner side relative to the outer ring, the inner ring including an inner-ring raceway surface around an outer circumferential surface; a plurality of tapered rollers disposed between the outer-ring raceway surface and the inner-ring raceway surface, the tapered roller including a rolling surface in contact with the outer-ring raceway surface and the inner-ring raceway surface; and a cage including a plurality of pockets arranged at prescribed intervals in a circumferential direction, the cage accommodating and holding the plurality of tapered rollers in the plurality of pockets, the cage including a smaller annular portion continuous on a smaller-diameter end face side of the tapered roller, a larger annular portion continuous on a larger-diameter end face side of the tapered roller, and a plurality of posts that couple the annular portions to each other, the plurality of tapered rollers including a nitrogen enriched layer formed on a surface layer of the rolling surface, a distance from an outermost surface of the surface layer to a bottom of the nitrogen enriched layer being not shorter than 0.2 mm, wherein in each tapered roller of the plurality of tapered rollers, T2 is smaller than T1 and T2 is smaller than T3, where T1 represents a distance at a first measurement point which is a boundary point between a chamfered portion (21, 25) of the tapered roller and a crowned portion (22, 24) where crowning is formed in the rolling surface of the tapered roller, T2 represents a distance at a second measurement point which is a position at a distance of 1.5 mm from a smaller end face of the tapered roller, and T3 represents a distance at a third measurement point at a center of the rolling surface of the tapered roller, wherein T1, T2 and T3 are values of depth of the nitrogen-enriched layer at the specified measurement points and a distance from the outermost surface of the nitrogen-enriched layer to the bottom of the nitrogen-enriched layer, and wherein a nitrogen concentration in the nitrogen enriched layer is not lower than 0.1 mass % at a position of depth of 0.05 mm from the outermost surface.