A taper roller bearing includes: an inner ring; an outer ring; taper rollers; and a cage. A first sliding surface is provided in at least one of annular portions of the cage to slide-contact end surfaces of the taper rollers so as to axially position the cage by the end surfaces of the taper rollers. Second sliding surfaces are provided in the pillar portions to slide-contact an outer ring raceway surface so as to radially position the cage by the outer ring raceway surface.