A sealed compressor comprising: an electric component including a stator and a rotor; a compression component actuated by the electric component; and a sealed container accommodating the electric component and the compression component and storing lubricating oil for lubricating the compression component; wherein the compression component includes a shaft including a main shaft section to which the rotor is fastened and an eccentric shaft section, a cylinder block accommodating a piston reciprocatable according to rotation of the shaft, a main bearing unit mounted on the cylinder block to support the main shaft section, and a thrust ball bearing disposed between a flange surface formed in the shaft and a thrust surface formed in the main bearing unit; the main shaft section is provided with a first oil feeding passage to transport the lubricating oil from a lower portion of the main shaft section to an upper portion of the main shaft section; the thrust ball bearing includes a plurality of balls held in a cage, an upper race disposed such that one of its main surfaces is in contact with upper portions of the balls; and a lower race disposed such that one of its main surfaces is in contact with lower portions of the balls; the main surface of the upper race and the main surface of the lower race face each other; at least one of the main surface of the upper race and the main surface of the lower race, the main surfaces facing each other, is provided with a raceway groove (137, 138) which is formed by an annular groove, and in which the balls are placed; and the thrust ball bearing is provided with a second oil feeding passage communicated with the first oil feeding passage and configured to feed the lubricating oil to the raceway groove (137, 138) and a discharge passage through which the lubricating oil fed to the raceway groove (137, 138) is discharged to outside of the thrust ball bearing; characterized in that the thrust surface of the main bearing unit is defined by a bottom surface of a recess formed in a main surface of the main bearing unit wherein the thrust surface is provided with a discharge hole to discharge the lubricating oil. an electric component including a stator and a rotor; a compression component actuated by the electric component; and a sealed container accommodating the electric component and the compression component and storing lubricating oil for lubricating the compression component; wherein the compression component includes a shaft including a main shaft section to which the rotor is fastened and an eccentric shaft section, a cylinder block accommodating a piston reciprocatable according to rotation of the shaft, a main bearing unit mounted on the cylinder block to support the main shaft section, and a thrust ball bearing disposed between a flange surface formed in the shaft and a thrust surface formed in the main bearing unit; the main shaft section is provided with a first oil feeding passage to transport the lubricating oil from a lower portion of the main shaft section to an upper portion of the main shaft section; the thrust ball bearing includes a plurality of balls held in a cage, an upper race disposed such that one of its main surfaces is in contact with upper portions of the balls; and a lower race disposed such that one of its main surfaces is in contact with lower portions of the balls; the main surface of the upper race and the main surface of the lower race face each other; at least one of the main surface of the upper race and the main surface of the lower race, the main surfaces facing each other, is provided with a raceway groove (137, 138) which is formed by an annular groove, and in which the balls are placed; and the thrust ball bearing is provided with a second oil feeding passage communicated with the first oil feeding passage and configured to feed the lubricating oil to the raceway groove (137, 138) and a discharge passage through which the lubricating oil fed to the raceway groove (137, 138) is discharged to outside of the thrust ball bearing; characterized in that the thrust surface of the main bearing unit is defined by a bottom surface of a recess formed in a main surface of the main bearing unit wherein the thrust surface is provided with a discharge hole to discharge the lubricating oil.