SAMPLE-INTRODUCING APPARATUS

PROBLEM TO BE SOLVED: To provide a sample-introducing apparatus which can introduce a sample with the use of a sampling valve connected to a measuring tube without generating a pressure shock and with good quantitative performance. SOLUTION: A sampling valve 10 is used which switches a first flow path constituted by connecting a sample introduction flow path (a), a measuring tube 11 and a discharge flow path (b) to collect a sample, and a second flow path constituted by connecting a carrier gas introduction flow path (c), the measuring tube 11 and a column entrance flow path (d) to supply the sample collected in the measuring tube to a column. When the first flow path is first set to collect the sample, a back pressure control valve 24 adjusts pressure of a pressure sensor 23 at the discharge flow path (b) to be equal to pressure of a pressure sensor 21 at the column entrance flow path (d). Then, the valve is switched to be in a second state. Accordingly, the sample can be supplied from the measuring tube to the column without generating a pressure shock when the valve is switched.