PURPOSE: To suppress the leak of the oil to a turbine side by spreading a turbine side sealed space by aslantly and upwardly drilling an oil jet hole which communicates with the upper part cooling space of an oil discharge chamber from an oil supply chamber and reducing the rate of the oil which reaches a shaft penetration port.

CONSTITUTION: When an impeller 3 is revolved by the pressure of the exhaust gas supplied into the housing 2 of a turbine 1, a compressor is driven through a rotary shaft 9, and air is compressed. The oil 22 which is supplied to a bearing part 7 from an oil feeding port 14 passes through an oil feeding hole 29 from an oil feeding hole 16 and is fed to a bearing 10 on the rotary shaft 9. Then, the oil 22 is returned to a lower part oil discharge space 18 from a return hole 25, and is discharged outside from an oil discharge port 17. Further, a portion of the oil 22 is splashed away in the radial direction by a slinger 20, and supplied into a turbine side sealed space 31. Further, a portion of the oil 22 is jetted into an upper part cooling space 19 from an oil jet hole 30 which is formed aslantly upward.