A sample heating device comprising: a sample injection section including an inner space configured to have carrier gas supplied thereto, and a sample boat gateway opening/closing mechanism ; a combustion tube , connected to the inner space of the sample injection section, configured to receive a flow of the carrier gas from the inner space; a heating furnace for heating the combustion tube; a control section ; and a boat operation mechanism for moving a sample boat arranged inside the inner space of the sample injection section into the combustion tube and back towards the sample injection section by a sample boat moving rod that is operable from outside the inner space, while maintaining air-tightness of the inner space by a sealing member , wherein the sealing member is arranged between the sample injection section and the sample boat moving rod with the sample boat moving rod contacting the sealing member, wherein the boat operation mechanism includes driving means for moving the sample boat moving rod according to an instruction from the control section; and a temperature sensor for measuring a temperature of the sample boat moving rod; wherein the control section is configured to cause the driving means to move the sample boat moving rod while controlling, based on a measured temperature value of the temperature sensor, an amount of pull-back in such a way that the sample boat moving rod only contacts the sealing member at a temperature at or below a predetermined temperature, at a time of pulling the sample boat moving rod such that a part of the sample boat moving rod which is located on a side of the combustion tube is pulled back towards the sample injection section. a sample injection section including an inner space configured to have carrier gas supplied thereto, and a sample boat gateway opening/closing mechanism ; a combustion tube , connected to the inner space of the sample injection section, configured to receive a flow of the carrier gas from the inner space; a heating furnace for heating the combustion tube; a control section ; and a boat operation mechanism for moving a sample boat arranged inside the inner space of the sample injection section into the combustion tube and back towards the sample injection section by a sample boat moving rod that is operable from outside the inner space, while maintaining air-tightness of the inner space by a sealing member , wherein the sealing member is arranged between the sample injection section and the sample boat moving rod with the sample boat moving rod contacting the sealing member, wherein the boat operation mechanism includes driving means for moving the sample boat moving rod according to an instruction from the control section; and a temperature sensor for measuring a temperature of the sample boat moving rod; wherein the control section is configured to cause the driving means to move the sample boat moving rod while controlling, based on a measured temperature value of the temperature sensor, an amount of pull-back in such a way that the sample boat moving rod only contacts the sealing member at a temperature at or below a predetermined temperature, at a time of pulling the sample boat moving rod such that a part of the sample boat moving rod which is located on a side of the combustion tube is pulled back towards the sample injection section. <EOS>