TAPERED ROLLER BEARING

To provide a tapered roller bearing provided with a retainer formed of resin capable of being molded by using a simple molding die, and capable of retaining a tapered roller stably when the tapered roller and the retainer are integrated, and capable of improving mechanical strength and lubricating performance on a guide surface as needed. A retainer 5 in the tapered roller bearing is formed of an injection molded body formed by injection molding a resin composition. The retainer 5 includes a large diameter ring portion 5a, a small diameter ring portion 5b, and a column portion 5c which joins both of them. A pocket portion 6 is formed between the column portions adjacent to each other. An injection molding die dividing line X along an axial direction is formed on the column portion 5c. A guide portion 5d for a tapered roller 4 formed of a surface, which narrows a width of an opening of the pocket portion in a circumferential direction, is arranged on the column portion 5c at a small diameter side with respect to the dividing line X and an outer diameter side of the retainer. A claw portion 5e for drop-off of the tapered roller 4 is arranged on the column portion 5c at a small diameter side with respect to the dividing line X and an inner diameter side of the retainer.