Patent ID: 8395400

Claim:
A testing device of semiconductor devices, comprising: a temperature detector detecting temperatures of a plurality of semiconductor devices for each of the semiconductor devices; and a temperature control unit controlling the temperatures of the semiconductor devices based on a detection result of the temperature detector, wherein the temperature control unit comprises: thermal heads being provided for each of the semiconductor devices and cooling or heating the corresponding semiconductor device; a plurality of first solution pipes through which a plurality of solutions set to mutually different temperatures flow in a parallel manner; a second solution pipe branched from one of the first solution pipes, passing through the thermal head, and joining the one of the first solution pipes; and a channel switching part closing a path of the first solution pipe, and controlling so that the solution is flown to the second solution pipe, and switching, for each of the first solution pipes, whether or not to make the solution flown through the first solution pipe flow through the thermal head, wherein the channel switching part is provided for each of the thermal heads.