A compressor configured for compressing a low-pressure gaseous refrigerant sucked therein to produce a high-pressure gaseous refrigerant to discharge, the compressor comprising: a suction pipe, configured to suck the low-pressure gaseous refrigerant, having a first pressure value; a discharge pipe, configured to discharge the high-pressure gaseous refrigerant, having a second pressure value, higher than the first pressure value; a first throttle portion for receiving an intermediate pressure refrigerant from an injection pipe of a refrigerant circuit, wherein the intermediate pressure refrigerant has an intermediate pressure value comprised between the first pressure value and the second pressure value; characterized in that it further comprises: an enlarged flow path portion for receiving the intermediate pressure refrigerant from the first throttle portion; a second throttle portion for receiving the intermediate pressure refrigerant from the enlarged flow path portion; and a compression element including a compression chamber for receiving the intermediate pressure refrigerant from the second throttle portion, the first throttle portion has a flow path cross-sectional area that is narrower than both a flow path cross-sectional area of the injection pipe and a flow path cross-sectional area of the enlarged flow path portion, and the second throttle portion has a flow path cross-sectional area that is narrower than the flow path cross-sectional area of the enlarged flow path portion. a suction pipe, configured to suck the low-pressure gaseous refrigerant, having a first pressure value; a discharge pipe, configured to discharge the high-pressure gaseous refrigerant, having a second pressure value, higher than the first pressure value; a first throttle portion for receiving an intermediate pressure refrigerant from an injection pipe of a refrigerant circuit, wherein the intermediate pressure refrigerant has an intermediate pressure value comprised between the first pressure value and the second pressure value; characterized in that it further comprises: an enlarged flow path portion for receiving the intermediate pressure refrigerant from the first throttle portion; a second throttle portion for receiving the intermediate pressure refrigerant from the enlarged flow path portion; and a compression element including a compression chamber for receiving the intermediate pressure refrigerant from the second throttle portion, the first throttle portion has a flow path cross-sectional area that is narrower than both a flow path cross-sectional area of the injection pipe and a flow path cross-sectional area of the enlarged flow path portion, and the second throttle portion has a flow path cross-sectional area that is narrower than the flow path cross-sectional area of the enlarged flow path portion. an enlarged flow path portion for receiving the intermediate pressure refrigerant from the first throttle portion; a second throttle portion for receiving the intermediate pressure refrigerant from the enlarged flow path portion; and a compression element including a compression chamber for receiving the intermediate pressure refrigerant from the second throttle portion, the first throttle portion has a flow path cross-sectional area that is narrower than both a flow path cross-sectional area of the injection pipe and a flow path cross-sectional area of the enlarged flow path portion, and the second throttle portion has a flow path cross-sectional area that is narrower than the flow path cross-sectional area of the enlarged flow path portion.