a housing having an intake chamber and a discharge chamber defined therein, an inlet port and an outlet port provided in an outer surface of said housing, and a discharge path connecting the discharge chamber and the outlet port;

a compressing unit provided in said housing, said compressing unit comprising a movable scroll and a stationary scroll defining a compression chamber configured to compress a working fluid supplied to the intake chamber from the inlet port and discharging the compressed working fluid to the discharge chamber, the working fluid including lubricating oil, wherein the discharge chamber is formed between the stationary scroll and an end wall of the housing;

a separating device arranged in the discharge path and separating a part of the lubricating oil in the working fluid from the working fluid;

a connection passage disposed in the discharge path, said connection passage providing fluid communication between said separating device and the outlet port, wherein the separating device comprises:

a separating chamber formed in the end wall of the housing adjacent to the discharge chamber and forming an upstream portion of the discharge path;

a separating tube arranged in the separating chamber, wherein a lower end opens into the separating chamber and an upper end is connected to a downstream portion of the discharge path, and configured to cause the working fluid flowed into the separating chamber to swirl around the separating tube, whereby a part of the lubricating oil is separated from the working fluid;

an oil storage chamber formed between the stationary scroll and the end wall of the housing, such that the oil storage chamber is arranged in a lower side of the separating chamber and collects the separated lubricating oil from the separating chamber; and

a return passage for returning the lubricating oil to the intake chamber from the oil storage chamber; and

a relief device in fluid communication with said connection passage for ejecting the working fluid in the discharge path to an outer side of the discharge path when a pressure in the discharge path exceeds a predetermined relief pressure in a downstream position of said separating device, wherein the relief device comprises a relief valve located near the outlet port, and wherein the housing further comprises:

a bulge portion integrally protruding to an inner side of the discharge chamber from the end wall and extending in a vertical direction; and

a cylindrical bore formed in the bulge portion, wherein the separating chamber is formed by a lower portion of the cylindrical bore, wherein said relief device is configured to reduce an amount of working fluid discharged when a pressure in the discharge path exceeds a predetermined relief pressure, and wherein the downstream portion of the discharge path is formed in the end wall of the housing, and includes the connection passage extending to the outlet port from an upper portion of the cylindrical bore, and wherein the connection passage has an axis orthogonal to an axis of the cylindrical bore.