To prevent abrasion of a head part of a rolling and to extend its lifetime by restraining skew of the rolling of a rolling element.

A forcing power is loaded from a rack shaft 4 to a pinion shaft 2 by a spring, etc., so as to hold the pinion shaft 2 and the rack shaft 4 at a predetermined distance. A pinion support bearing 20 for a vehicular steering for rotatably supporting the lower end of the pinion shaft 2 is composed of a radial rolling bearing having the rolling 21 as the rolling element. Crowning is provided on a track face of an outer wheel 22 of the rolling bearing 20 so as to thicken the lower end side of the pinion shaft 2. Or crowning is provided on a rolling face of the rolling 21 of the rolling bearing 20 so as to thicken the lower end side of the pinion shaft 2.