To provide a vacuum environmental testing apparatus which reduces the consumption amount of liquid nitrogen in a vacuum apparatus equipped with a contamination panel.

The vacuum environmental testing apparatus equipped with the contamination panel in an vacuum vessel containing a sample includes: means for supplying liquid nitrogen, means for separating the supplied nitrogen into a gas phase and a liquid phase, means for supplying nitrogen in the separated phases to contamination panels independent from each other; and means for releasing high temperature nitrogen gas vaporized with the rise of temperature in the contamination panel into atmosphere.

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