A hermetic compressor is provided to use a fixing bolt or a bush formed with a material having a thermal expansion coefficient higher than that of a cylinder for keeping stable coupling between the fixing bolt and a bolt coupling hole in spite of different thermal expansion of the cylinder and the fixing bolt, thereby preventing deterioration of compressor performance. A hermetic compressor includes a cylinder(20) having a compression chamber, and a cylinder head(40) coupled with the cylinder for sealing the compression chamber. A fixing bolt(50) is coupled with the cylinder to couple the cylinder head to the cylinder and formed of a material having a thermal expansion coefficient higher than that of the cylinder. A bolt coupling hole(24) is formed in the cylinder for coupling the fixing bolt. A bush(60) is interposed between the fixing bolt and the bolt coupling hole and formed of a material having a thermal expansion coefficient higher than that of the cylinder.
