A rotary compressor which uses refrigerant including R32, and which stores oil and a compression element in a hermetic container , wherein the compression element comprises: a shaft having an eccentric portion ; a cylinder forming a compression chamber concentrically with a rotation center of the shaft ; a bearing which hermetically closes both side surfaces of the cylinder and which pivotally supports the shaft ; a piston which is mounted on the eccentric portion and which rolls along an inner wall of the cylinder by rotation of the shaft ; a vane which is fitted into a vane groove and which partitions the compression chamber into a high pressure chamber and a low pressure chamber , wherein the vane contacts the outer periphery of the piston and follows the piston which rolls along an inner wall surface of the cylinder and reciprocates the vane in the vane groove , a spiral oil groove is provided in an inner peripheral surface of the bearing , and one end of the oil groove opens at a bearing base portion which is on a side of the compression chamber , and another end of the oil groove opens at a bearing end which is on a side of a space in the hermetic container , characterized in that in the spiral oil groove , an opening of the bearing end is located along the inner peripheral surface of the bearing in a rotation direction of the shaft ahead of an opening of the bearing base portion ; and in that the oil groove is provided in an angular region not containing an axial locus (A) of the eccentric portion , the angular region being one where no load is applied to the bearing when the eccentric portion rotates under a varying load. a shaft having an eccentric portion ; a cylinder forming a compression chamber concentrically with a rotation center of the shaft ; a bearing which hermetically closes both side surfaces of the cylinder and which pivotally supports the shaft ; a piston which is mounted on the eccentric portion and which rolls along an inner wall of the cylinder by rotation of the shaft ; a vane which is fitted into a vane groove and which partitions the compression chamber into a high pressure chamber and a low pressure chamber , wherein the vane contacts the outer periphery of the piston and follows the piston which rolls along an inner wall surface of the cylinder and reciprocates the vane in the vane groove , a spiral oil groove is provided in an inner peripheral surface of the bearing , and one end of the oil groove opens at a bearing base portion which is on a side of the compression chamber , and another end of the oil groove opens at a bearing end which is on a side of a space in the hermetic container , the vane contacts the outer periphery of the piston and follows the piston which rolls along an inner wall surface of the cylinder and reciprocates the vane in the vane groove , a spiral oil groove is provided in an inner peripheral surface of the bearing , and one end of the oil groove opens at a bearing base portion which is on a side of the compression chamber , and another end of the oil groove opens at a bearing end which is on a side of a space in the hermetic container , characterized in that in the spiral oil groove , an opening of the bearing end is located along the inner peripheral surface of the bearing in a rotation direction of the shaft ahead of an opening of the bearing base portion ; and in that the oil groove is provided in an angular region not containing an axial locus (A) of the eccentric portion , the angular region being one where no load is applied to the bearing when the eccentric portion rotates under a varying load. <EOS>