PURPOSE: To reduce a differential sliding amount, suppress original heat generation, and enable high-speed rotation by constructing such that top points of virtual cones which are respectively formed by an outer diameter orbit surface of an inner ring, an inner diameter orbit surface of an outer ring, and rolling bodies approach one another on an axis of the inner and outer rings.

CONSTITUTION: A plurality of rolling bodies 3 are arranged between an inner ring 1 which has an outer diameter orbit surface 11 provided with a conical surface and an outer ring 2 which has an inner diameter orbit surface 21 also provided with a conical surface and arranged oppositely to the outer diameter orbit surface 11 for forming an orbit of the rolling bodies 3. Each rolling body 3 is a tapered roller which has a self-motion axis R inclined by a specified angle α from a sectional surface including an axis O of the inner and outer rings 1 and 3. Top points of virtual cones drawn respectively by the inner ring 1, outer ring 2, tapered rollers 3 approach one another on the axis O. That is, a projected line R' prepared by projecting the self-motion axis R of the tapered roller 3 inclined by the angle α onto the sectional surface including the axis O intersects an extended line P of the outer diameter orbit surface 11 of the inner ring at one point on the axis O, while an extended line of the inner diameter orbit surface 21 of the outer ring 2 intersects.