A scroll compressor, in which revolving spiral blade part (13) is subjected to an intermediate pressure between pressures on the outlet and inlet sides at the back thereof, is provided with such means as controlling and cooling the abovesaid intermediate pressure with lubricant oil reserved in the lubricant reservoir (26) on which discharge pressure in a closed vessel (1) acts. Lubricant oil to be fed to the compressive part is secured under any pressure conditions and stably fed at any time. The lubricant oil is so cooled as not to cause significant fall of efficiency.
