Rotating machine and turbocharger

A rotating machine comprising:

• a rotating shaft extending along an axis;
• a bearing which has an inner ring externally fitted onto the rotating shaft, an outer ring provided on an outer peripheral surface side of the inner ring, and rolling bodies disposed between the inner ring and the outer ring, and supports the rotating shaft such that the rotating shaft is rotatable around the axis;
• and
• a housing which has an inner peripheral surface that forms a clearance, in which oil is disposed, between the inner peripheral surface and an outer peripheral surface of the outer ring, and a first oil supply hole that supplies the oil to the clearance,
• wherein a groove portion, which guides the oil in a direction toward the first oil supply hole as the groove portion is directed to a rotation direction front side of the rotating shaft, is formed on at least one of the outer peripheral surface of the outer ring and the inner peripheral surface of the housing facing the outer peripheral surface of the outer ring,
• an outer side end of the groove portion is formed not to reach an end of the housing,
• the groove portion includes a first groove,
• the first groove is inclined with respect to a rotation direction in which the rotating shaft is rotated and an axis direction when viewed in a radial direction of the rotating shaft,
• the first groove is formed in an outer side region which is between the first oil supply hole and one of both ends of the outer ring which is close to a forming position of the first oil supply hole in the axis direction,
• the first groove is inclined in a direction toward the first oil supply hole from the end of the outer ring, and
• an inner side end of the first groove is disposed on an outer side of the first oil supply hole in the axis direction.