A thrust roller bearing comprises a plurality of cylindrical rollers each having a rolling surface on its side surface and a cage formed of a disk-shaped member having a hole formed in the center and comprising a plurality of pockets penetrating in a thickness direction for housing the rollers. The pocket has a plurality of stopper parts at a wall surface opposed to the rolling surface of said roller, and a plurality of guide parts between said adjacent stopper parts. When it is assumed that the distance between the outer wall surface of said pocket in the diameter direction and the guide part located on the outer side in the diameter direction of the two guide parts is L1 and the distance between the inner wall surface of said pocket in the diameter direction and the guide part located inner side in the diameter direction of the two guide parts is L3, it is satisfied that L1>L3.