A compressor and a method for assembling a compressor are provided. The compressor may include a compressor casing (300) coupled to each of a suction inlet (100), into which a refrigerant may be introduced, and a discharge outlet (200), through which the refrigerant may be discharged, a compressor body (400) mounted inside the compressor casing (300) to compress the refrigerant suctioned in through the suction inlet (100), and then discharge the refrigerant through the discharge outlet (200), a noise reducing member (520,530) disposed between the compressor body (400) and the compressor casing (300), and at least one fixing member (540,560) mounted inside the compressor casing (300) to fix the noise reducing member (520,530) to an inner wall of the compressor casing (300).