Bearing device

A bearing device comprising:

• an outer ring housing in a cylindrical shape which is provided in a casing and has a discharge hole in an axially central portion of the outer ring housing and a notch groove passing through an axial end surface of the outer ring housing in a radial direction;
• and
• each axial end of the outer ring housing configured with a rolling bearing mounted thereon and configured to rotatably support a rotational shaft positioned radially inside of the outer ring housing,
• wherein oil supplied to a portion between an inner peripheral surface of the casing and an outer peripheral surface of the outer ring housing is supplied into each rolling bearing via a portion between the axial end surface of the outer ring housing and a side wall surface of the casing, the oil passing through each rolling bearing is discharged from an annular space defined between the rolling bearings in both the axial ends of the outer ring housing through the discharge hole, wherein
• the end surface of the outer ring housing has an annular shape, and the notch groove is provided in a portion of an upper half area of the end surface,
• an additional notch groove other than the notch groove is provided in a portion of a lower haft area of the end surface, and
• a groove cross-sectional area of the notch groove is smaller than a groove cross-sectional area of the additional notch groove.