A gas cooker comprising: a top plate having a surface on which food is seated; a case configured to form a space shielded by the top plate; a grille vent; a plurality of burners provided inside the case, and in which a red-heat plate is heated by combustion of a fuel gas, wherein each burner includes: - a burner port through which a mixed gas is introduced and at which the red-heat plate is seated, and - a burner holder provided between the burner port and the top plate, wherein the burner port is seated at the burner holder and wherein the burner holder includes a burned gas guide portion extending from the burner port to the grille vent to guide a burned gas; wherein the grille vent is provided at the case and through which the burned gas of the burner is discharged; an insulator case provided under the top plate, and configured to accommodate the plurality of burners; and an upper insulator disposed along an outer side of each of the plurality of burners, and interposed between the insulator case and the top plate to seal a combustion space of each of the plurality of burners, wherein the upper insulator is formed of an elastically deformable material, and wherein the upper insulator is inserted between the burners and the insulator case and the upper insulator shields between the plurality of burners, and wherein an upper surface of the upper insulator is formed to be in close contact with a lower surface of the top plate to press the upper insulator. a top plate having a surface on which food is seated; a case configured to form a space shielded by the top plate; a grille vent; a plurality of burners provided inside the case, and in which a red-heat plate is heated by combustion of a fuel gas, wherein each burner includes: - a burner port through which a mixed gas is introduced and at which the red-heat plate is seated, and - a burner holder provided between the burner port and the top plate, wherein the burner port is seated at the burner holder and wherein the burner holder includes a burned gas guide portion extending from the burner port to the grille vent to guide a burned gas; - a burner port through which a mixed gas is introduced and at which the red-heat plate is seated, and - a burner holder provided between the burner port and the top plate, wherein the burner port is seated at the burner holder and wherein the burner holder includes a burned gas guide portion extending from the burner port to the grille vent to guide a burned gas; wherein the grille vent is provided at the case and through which the burned gas of the burner is discharged; an insulator case provided under the top plate, and configured to accommodate the plurality of burners; and an upper insulator disposed along an outer side of each of the plurality of burners, and interposed between the insulator case and the top plate to seal a combustion space of each of the plurality of burners, wherein the upper insulator is formed of an elastically deformable material, and wherein the upper insulator is inserted between the burners and the insulator case and the upper insulator shields between the plurality of burners, and wherein an upper surface of the upper insulator is formed to be in close contact with a lower surface of the top plate to press the upper insulator.