of u201c embodiment 1 u201d is more than twice the life of u201c comparative example 1 u201d furthermore the life of u201c embodiment 2 u201d is approximately five or more times the life of u201c embodiment 1 u201d although the roller coefficient thereof is the same 0 96 as that of u201c embodiment 1 u201d u201c comparative example 1 u201d u201c embodiment 1 u201d and u201c embodiment 2 u201d measure 45 inner diameter u00d7 81 outer diameter u00d7 16 overall width unit mm the number of the rollers in u201c comparative example 1 u201d is 24 the number of the rollers in u201c embodiment 1 u201d and u201c embodiment 2 u201d is 27 and oil film parameter u03bb is 0 2 next a modified embodiment according to the present invention will be described referring to fig5 and 6 in the tapered roller bearing 1 shown in the figures protruding sections 5 f having a convex shape protruding to the outer ring raceway surface are formed on the outer diameter surfaces of the pole sections 5 c of the cage 5 that is integrally molded of an engineering plastic in other respects the cage 5 is the same as that described above the contour of the protruding section 5 f in the cross sectional direction of the pole section 5 c is arc shaped as shown in fig6 the curvature radius r 2 of this arc shape is made smaller than the radius r 1 of the outer ring raceway surface the shape is determined so that a proper wedge shaped oil film is formed between the protruding.