To provide a bearing device allowing positive and easy pre-load adjustment by spacers with no change of pre-load quantity without causing the inclination of outer rings when mounted to a housing.

Double rows of outer diameter grooves 3, 4 are directly formed at a distance on the outer periphery of a shaft 1. Inner diameter grooves 5a, 6a are formed in relation to the outer diameter grooves 3, 4 of the shaft 1, and outer rings 5, 6 are arranged at a distance on the outer periphery of the shaft 1. The requested number of rolling elements 8... are respectively built in raceway track grooves 7, 7 formed by the outer diameter grooves 3, 4 of the shaft 1 and the inner diameter grooves 5a, 6a of the outer rings 5, 6, and two spacers 10, 11 built in between the outer rings 5, 6 are pushed in to move in the mutually sliding state of opposed inclined faces 10a, 11a of the spacers 10, 11 to adjust pre-load in the separating direction of the outer rings 5, 6.