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In a conical roller bearing for supporting a pinion shaft of a differential gear, the contact angle .alpha. of a conical roller bearing for supporting the pinion shaft is controlled between 22.degree. and 28.degree.; the ratio of the diameter Da of the conical roller at the larger-diameter end face

In a conical roller bearing for supporting a pinion shaft of a differential gear, the contact angle .alpha. of a conical roller bearing for supporting the pinion shaft is controlled between 22.degree. and 28.degree.; the ratio of the diameter Da of the conical roller at the larger-diameter end face to its length L is controlled between 0.51 and 1.0; and the roller number coefficient k is controlled to range from 1.16 to 1.32. The conical roller bearing constructed thus contributes to better fuel economy on automobiles by fully ensuring the necessary levels of fatigue strength and bearing rigidity and yet reducing the dynamic torque it develops.

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[ What is claimed is:] [1.] A conical roller bearing for supporting a pinion shaft of a differential gear, comprising:an inner race having an inner raceway in an outer circumference of the inner race, and fitted around the pinion shaft;an outer race having an outer raceway in an inner circumference

[ What is claimed is:] [1.] A conical roller bearing for supporting a pinion shaft of a differential gear, comprising:an inner race having an inner raceway in an outer circumference of the inner race, and fitted around the pinion shaft;an outer race having an outer raceway in an inner circumference of the outer race; and a plurality of conical rollers arranged rollingly between the inner raceway and the outer raceway at a contact angle which the outer raceway is inclined with respect to a center line through the outer race, wherein the contact angle is 22.degree. to 28.degree., a Da/L value of Da to L is 0.51 to 1.0 where Da is a large diameter of each conical roller and L is a length of each conical roller, and a roller number coefficient defined by k=(d.sub.m /Da).multidot.sin(180.degree./z) is 1.16 to 1.32 where d.sub.m is a diameter of a pitch circle in which the conical rollers are arranged and z is the number of conical rollers.