A curvature radius of a large rib end face of an inner ring is set to a value larger than a distance R, and a curvature radius of a large end face of a tapered roller is set to a range of 80 to 100% relative to the distance R, where R represents a distance from a cone center of the tapered roller to a predetermined reference point that is separated from the cone center along an inner ring raceway surface. A center of a contact ellipse that is formed by contact between the large end face of the tapered roller and the large rib end face of the inner ring is located on an imaginary straight line passing through a center of curvature of the large end face of the tapered roller and a center of curvature of the large rib end face of the inner ring.