This gas chromatograph 1 is provided with a cooling device 8. The cooling device 8 comprises an inner supply pipe 83. The inner supply pipe 83 extends to the vicinity of a region, in which a column 2 is arranged, within a column oven 3. A coolant which is supplied from an external supply pipe 81 toward the inside of the column oven 3 flows into the inner supply pipe 83, and is subsequently ejected into the column oven 3 through an ejection port 83A. At this time, the inside of the column oven 3 is cooled by means of the inner supply pipe 83, which internally contains the coolant, and is further cooled by means of the coolant that is supplied into the column oven 3 through the inner supply pipe 83. In this manner, the inside of the column oven 3 is cooled in stages by means of the inner supply pipe 83 itself and the coolant which is supplied from the inner supply pipe 83. Consequently, the temperature within the column oven 3 is able to be controlled with high accuracy by means of the cooling device 8.
