SAMPLE INTRODUCTION SYSTEM

In a sample introducing system that can be easily adapted to a variety of analytical conditions without being affected by a flow rate of gas introduced into an analytical device, can introduce an analytical sample into the analytical device without loss, and can contribute to a simple and highly accurate high-sensitivity analysis, a pretreatment device 1 removes unnecessary components from an untreated sample gas G1 containing the analytical sample. A treated sample gas G4 that has been pretreated by the pretreatment device 1 is introduced into the analytical device 30 via a connection gas flow channel 20. A gas addition device 40 that adds a carrier gas G7 to the treated sample gas G4 flowing toward the analytical device 30 in the connection gas flow channel 20 has a means for changing the addition flow rate of the carrier gas G7. Pressure fluctuations of the gas containing the analytical sample are restricted by a pressure adjusting device 50 upstream of the gas addition device 40.