A sample introduction probe for introducing a gas sample to a mass spectrometer, having an inner pipe for conducting the sample to be analyzed, and an outer pipe installed outside of the inner pipe. An opening is installed at one end of the inner pipe for enabling entry of the sample into the inner pipe. A pump is installed on a side of the one end of the inner pipe, and a probe tip heater is provided for heating the one end of the inner pipe, a heater for heating the inner pipe.