PURPOSE: To accurately measure the temperature dependency of a subject to be measured which has adhesive strength by integrating the sample mounting portion of an adhesive strength measuring portion into a constant temperature chamber so as to prevent the sample mounting portion from being affected by external temperature and the like.

CONSTITUTION: The sample mounting portion 40 of an adhesive strength measuring portion 1 is integrated into a constant temperature chamber 36 so as to prevent the sample mounting portion 40 from being affected by external temperature. In this case, the adhesive strength measuring portion 1 is provided on a supporting plate 33 installed on the bottom portion 41 of the chamber 36. The adhesive strength measuring portion 1 is horizontally held by an adjusting screw 32 attached to a lower frame 22.