To provide a tapered roller bearing for a vehicle of a rolling stock which can be used for a long period without losing lubricity since the volume of grease kept inside the seal case is big enough and grease overspill from a step of the seal case to the outside of the seal case can be prevented.

Tapered roller bearings for the vehicle of the rolling stock comprise an bearing outer ring 2 and a bearing inner ring 1 placed opposite relatively rotatably arranged, a tapered roller 3 incorporated between the outer ring 2 and the inner ring 1, a retainer 4 of a cage-type holding the tapered roller 3 in the equal intervals and an annular seal case 8 fixed to the outer ring large-diameter side end portion 2b. The seal case 8 is lengthened by having the step 8b which has a diameter smaller than the inner diameter of the fixed end portion 8a in the outside direction of the bearing from the fixed end portion 8a fixed in the outer ring large-diameter side end portion 2b and at the same time, in the step 8b the seal 7 to seal the bearing inside is internally fitted and the inner diameter dimension d1 of the step 8b is smaller than the inner diameter dimension d2 of the large diameter side end portion 4b of the cage-type retainer 4.