restoring force of the elastic member 80 having been compressed between the installation elements 75 thereby the supporting members 79 holding both ends of the module ic 1 with such operations if all module ics 1 to be tested are loaded and held by the supporting member 79 the carrier is transferred to the inside of the sealed chamber not shown by the transferring means where the module ics are heated at a temperature selected for the tests e g about 70 to 90 degrees and then transferred to the test site for the thermal resistance tests it will be understood that the contacts can be made with the horizontal or vertical positioning of the carrier being determined based upon the installation direction of the test socket in this case since separate pusher not shown presses the module ic 1 contained in the housing 72 toward the test socket the carrier is moved to a test socket by the pressing force of the pusher and after finishing the tests separate discharging lever which is equipped in the test socket pulls out the module ic inserted in the test socket so that it becomes possible to transfer the module ic to the subsequent process if at the test site the tests are finished and the carrier is transferred to the unloading position separate picking up means disposed at the unloading unit is moved to this place to hold the module ic held between the supporting members 79 and sorts by the tests results and store them in the unloading tray thus the thermal resistance tests for the module ics are completed at the operation described above the.