A gas chromatograph for injecting a sample from a syringe into a sample vaporization chamber connected to a column and introducing a sample vaporized in the sample vaporization chamber into the column, the gas chromatograph comprising: a first storage section for storing a sample solution that is a first solvent containing a sample; a second storage section for storing a pseudo matrix solution that is a second solvent, with higher polarity than the first solvent, in which a pseudo matrix is dissolved; a suction control unit for causing the sample solution in the first storage section and the pseudo matrix solution in the second storage section to be sucked into the syringe; and an injection control unit for causing the sample solution and the pseudo matrix solution to be vaporized in the sample vaporization chamber, by causing the sample solution and the pseudo matrix solution sucked into the syringe to be injected into the sample vaporization chamber; wherein the suction control unit is configured to cause the pseudo matrix solution in the second storage section to be sucked into the syringe, after causing the sample solution in the first storage section to be sucked into the syringe; and wherein the injection control unit is configured to cause the sample solution in the syringe to be injected into the sample vaporization chamber after a lapse of a certain period of time after causing the pseudo matrix solution in the syringe to be injected into the sample vaporization chamber, wherein the certain period of time is a period of time set so that an analysis target substance contained in the sample solution is vaporized and introduced into the column after the pseudo matrix is vaporized and is sufficiently bound to an active site. a first storage section for storing a sample solution that is a first solvent containing a sample; a second storage section for storing a pseudo matrix solution that is a second solvent, with higher polarity than the first solvent, in which a pseudo matrix is dissolved; a suction control unit for causing the sample solution in the first storage section and the pseudo matrix solution in the second storage section to be sucked into the syringe; and an injection control unit for causing the sample solution and the pseudo matrix solution to be vaporized in the sample vaporization chamber, by causing the sample solution and the pseudo matrix solution sucked into the syringe to be injected into the sample vaporization chamber; wherein the suction control unit is configured to cause the pseudo matrix solution in the second storage section to be sucked into the syringe, after causing the sample solution in the first storage section to be sucked into the syringe; and wherein the injection control unit is configured to cause the sample solution in the syringe to be injected into the sample vaporization chamber after a lapse of a certain period of time after causing the pseudo matrix solution in the syringe to be injected into the sample vaporization chamber, wherein the certain period of time is a period of time set so that an analysis target substance contained in the sample solution is vaporized and introduced into the column after the pseudo matrix is vaporized and is sufficiently bound to an active site.