To provide a thrust tapered roller bearing enhancing durability without causing a generation of heat and abnormal abrasion by receiving a large thrust load by either one of an inner ring or an outer ring.

The thrust tapered roller bearing 10 is provided with the inner ring 11 fitted to a shaft 18; the outer rings 13 arranged at both sides of the inner ring 11 and having outer ring side large flanges 14; a retainer 15 arranged between the inner and outer rings; tapered rollers 16 rollably retained by the retainer 15. An inner ring side large flange 12 arranged opposed to the outer ring side large flange 14 of the outer ring 13 and butted to an end surface of the tapered roller 16 are formed on the inner ring 11.