Turbocharger

A turbocharger comprising:

• a compressor housing provided therein with an air flow path in which an impeller is disposed;
• and
• a bearing housing for rotatably supporting a rotor shaft to which the impeller is connected, wherein:
• the air flow path includes a suction port through which air is sucked toward the impeller, and a discharge scroll chamber which is formed on an outer peripheral side of the impeller in its circumferential direction, and which guides, to outside, compressed air discharged from the impeller;
• the compressor housing includes a shroud surface facing to the impeller, and a diffuser surface extending from the shroud surface toward the discharge scroll chamber;
• the bearing housing includes a facing surface which is facing to the diffuser surface of the compressor housing and which forms a diffuser passage between the facing surface and the diffuser surface;
• a cleaning agent supplying unit is provided in at least one of the diffuser surface of the compressor housing and the facing surface of the bearing housing;
• and
• the cleaning agent supplying unit includes a porous supplying portion made of porous material for forming at least a portion of the diffuser surface or the facing surface, and is configured such that cleaning agent for preventing adhesion of deposits is supplied from the porous supplying portion to the diffuser surface or the facing surface.