ENVIRONMENTAL TESTING DEVICE

To provide an environmental testing apparatus capable of sufficiently ensuring a space in a chamber, and of carrying out an environmental test sufficiently considering various environments. An environmental testing apparatus 1 includes a chamber 10, a cooling unit 50 including a cooling apparatus of a brine that cools the inside of the chamber 10, a heating unit 60 and a control apparatus 70. The cooling apparatus includes: a high temperature side cooling circuit in which a high temperature side compressor, a condenser, a high temperature side expansion valve and a cascade condenser are connected in this order by pipes so as to circulate a high temperature side heating medium; and a low temperature side cooling circuit in which a low temperature side compressor, the cascade condenser, a low temperature side expansion valve and an evaporator are connected in this order by pipes so as to circulate a low temperature side heating medium. The low temperature side heating medium is cooled by the high temperature side heating medium in the cascade condenser, while the brine is cooled by the low temperature side heating medium in the evaporator. The control apparatus 70 controls a temperature inside the chamber 10 within a temperature zone of between -67.5°C and 127.5°C.