A scroll compressor having an overheat preventing unit includes a casing; a driving motor installed in the casing and generating a driving force; a compression unit connected with the driving motor by a rotating shaft, and compressing a fluid and discharging it externally when the driving motor is driven; and an overheat preventing unit installed at one side of the compression unit and sensing a temperature of a gas compressed in a compressing chamber of the compression unit, and bypassing a high temperature and high pressure gas of a high pressure chamber to a low pressure chamber if the sensed temperature of the gas goes up beyond a pre-set value.