An environmental testing apparatus (10) includes a test chamber (12) including a test area (TA), a high-temperature chamber (14), a low-temperature chamber (16), an airflow generator (33) for generating an airflow in the test area (TA), the airflow being from a low-temperature inlet port (22a) through which cooled air is led into the test area (TA) from the low-temperature chamber (16) toward a low-temperature outlet port (22b) through which air is led out from the test area (TA) to the low-temperature chamber (16), and a gas jacket (35) for flowing a cooling gas to cool a region closer to the low-temperature outlet port (22b) than to the low-temperature inlet port (22a) more intensively than a region closer to the low-temperature inlet port (22a) than to the low-temperature outlet port (22b) in a wall face (37a) that defines the test area (TA).

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