A sample introduction device 100 includes a heating unit 102, an ultraviolet irradiation unit 103, and a sample supply part 106. The heating unit 102 vaporizes a sample 22 by heating externally a container 2 in which the sample 22 is enclosed. The ultraviolet irradiation unit 103 causes ultraviolet rays to pass through the container 2 and irradiates the sample 22 with the ultraviolet rays. The sample supply part 106 supplies the sample vaporized in the container 2 to a gas chromatograph 1 side.