A measurement device for estimating thermal characteristics comprising; a heat generating source unit that has heat sensors for detecting heat radiating toward a measurement sample unit, and that is for heating the measurement sample unit; the measurement sample unit; a heat cooling source unit that has heat sensors for detecting heat radiating from the measurement sample unit, and that is for cooling the measurement sample unit; and a support unit that is provided for them, wherein those units are sequentially stacked, the measurement sample unit has a three-layer structure consisting of an object to be measured for estimating thermal characteristics, and heat conducting materials that sandwich the object, the heat conducting materials are adhered to the heat generating source unit and the heat cooling source unit one another through a reducing agent for a value of interfacial contact thermal resistance comprising a heat-transfer promoting agent, therebetween, the heat-transfer promoting agent includes: high purity water selected from heavy water, distilled water and ion-exchanged water, and at least any one of a surface active agent selected from a cationic surfactant, a nonionic surfactant, an anionic surfactant, and an ampholytic surfactant; a water-soluble polymer selected from carboxy methyl cellulose, polyethylene glycol, and polyvinyl alcohol; a builder selected from sodium sulfate, sodium sulfite, sodium carbonate, ammonium sulfite, ammonium carbonate, sodium phosphate, sodium silicate, ammonium silicate, ammonium phosphate, sodium phosphite, ammonium phosphite, sodium nitrate, sodium nitrite, ethylenediaminetetraacetic acid, ethylenediamine, and ammonium ethylenediaminetetraacetate; a metallic surface stabilizer selected from triazine trithiol metallic salt, benzotriazole hydrochloride, ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid - lactic acid, resorcin, t-butylphenol, and aminophenyl aniline, the object to be measured for estimating thermal characteristics and the heat conducting materials are adhered to one another through physical contact, chemical contact, and/or chemical bond contact, a metallic block is contacted on the heat generating source unit and the measurement sample unit, and another metallic block is contacted on the heat cooling source unit and the measurement sample unit. a heat generating source unit that has heat sensors for detecting heat radiating toward a measurement sample unit, and that is for heating the measurement sample unit; the measurement sample unit; a heat cooling source unit that has heat sensors for detecting heat radiating from the measurement sample unit, and that is for cooling the measurement sample unit; and a support unit that is provided for them, wherein those units are sequentially stacked, the measurement sample unit has a three-layer structure consisting of an object to be measured for estimating thermal characteristics, and heat conducting materials that sandwich the object, the heat conducting materials are adhered to the heat generating source unit and the heat cooling source unit one another through a reducing agent for a value of interfacial contact thermal resistance comprising a heat-transfer promoting agent, therebetween, the heat-transfer promoting agent includes: high purity water selected from heavy water, distilled water and ion-exchanged water, and at least any one of a surface active agent selected from a cationic surfactant, a nonionic surfactant, an anionic surfactant, and an ampholytic surfactant; a water-soluble polymer selected from carboxy methyl cellulose, polyethylene glycol, and polyvinyl alcohol; a builder selected from sodium sulfate, sodium sulfite, sodium carbonate, ammonium sulfite, ammonium carbonate, sodium phosphate, sodium silicate, ammonium silicate, ammonium phosphate, sodium phosphite, ammonium phosphite, sodium nitrate, sodium nitrite, ethylenediaminetetraacetic acid, ethylenediamine, and ammonium ethylenediaminetetraacetate; a metallic surface stabilizer selected from triazine trithiol metallic salt, benzotriazole hydrochloride, ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid - lactic acid, resorcin, t-butylphenol, and aminophenyl aniline, high purity water selected from heavy water, distilled water and ion-exchanged water, and at least any one of a surface active agent selected from a cationic surfactant, a nonionic surfactant, an anionic surfactant, and an ampholytic surfactant; a water-soluble polymer selected from carboxy methyl cellulose, polyethylene glycol, and polyvinyl alcohol; a builder selected from sodium sulfate, sodium sulfite, sodium carbonate, ammonium sulfite, ammonium carbonate, sodium phosphate, sodium silicate, ammonium silicate, ammonium phosphate, sodium phosphite, ammonium phosphite, sodium nitrate, sodium nitrite, ethylenediaminetetraacetic acid, ethylenediamine, and ammonium ethylenediaminetetraacetate; a metallic surface stabilizer selected from triazine trithiol metallic salt, benzotriazole hydrochloride, ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid - lactic acid, resorcin, t-butylphenol, and aminophenyl aniline, the object to be measured for estimating thermal characteristics and the heat conducting materials are adhered to one another through physical contact, chemical contact, and/or chemical bond contact, a metallic block is contacted on the heat generating source unit and the measurement sample unit, and another metallic block is contacted on the heat cooling source unit and the measurement sample unit.