PURPOSE: To improve the reliability by making a bearing easy to follow the inclination of a rotary shaft without increasing the frictional resistance between a bearing and a spherical supporting seat even if the weight of a rotor increases.

CONSTITUTION: This bearing device is composed of a bearing base lower half 12 and a bearing base upper half 13, which are divided on an axial horizontal, and a bearing 21, and the periphery 21 a of a bearing 21 is nearly spherical, and the bearing base lower half 12 and the bearing base upper half 13 are provided with spherical supporting seats 22, which have inside peripheries 22a engaging with this outside periphery 21 a and are divided on the axial horizontal. This spherical supporting seat 22 is provided, at the inside periphery 22a, with a high-pressure oil circulating hole 23 for circulating high-pressure oil from a high-pressure oil feeder 4 and a supporting oil groove 24 in the shape of a circular recess leading to this high-pressure oil circulating hole 23, and the bearing hole 21 is provided with a high-pressure oil circulation hole 25 leading to this supporting seat oil groove 24 and bearing oil grooves 16 and 16.