PURPOSE: To enable the common use of a thermoelectric element, to simplify the constitution of a calorimeter and to prevent the generation of the error caused by the characteristic difference of two thermoelectric elements, by constituting a symmetric specimen part having a reference specimen container receiving hole, a specimen container receiving hole and a fine gap while mounting the thermoelectric element to said fine gap so as to detect the temp. difference between both wall surfaces of said fine gap.

CONSTITUTION: A specimen and heat receiving member 1 consists of a symmetric specimen part 5 having reference specimen container receiving hole 2, a specimen container receiving hole 3 and a fine gap 4, the heat receiving part 7 opposed to a heat generating part 6 and a heat transfer part 8 having a narrow cross-sectional area for connecting said heat generating part 7 and the aforementioned specimen part 5 and a thermo-module 9 for detecting the temp. difference between both wall surfaces of the fine gap 4 is inserted into said fine gap 4. Even if these is unbalance in thermal resistance in the same places between the heat generating part and the heat receiving part, heat can be uniformly supplied to the reference specimen 18 and the specimen 19.