Abstract: The present invention relates to a burn-in tester, and according to one aspect of the present invention, there is provided a burn-in tester comprising: a board chamber provided to accommodate a test board; a test chamber having an accommodation space for accommodating a tester substrate, a first side surface forming the accommodation space and a second side surface opposite to the first side surface, which is provided such that the air introduced into the accommodation space through the first side surface passes through the accommodation space to be discharged out of the accommodation space through the second side surface; a blowing unit located on the first side surface side of the test chamber and including a plurality of blast fans for generating an air flow from the first side surface side to the second side surface side; and a temperature control unit provided to control the temperature in the test chamber using a refrigerant circulation cycle and equipped with an evaporator located on the second side su