Dew formation testing device and dew formation testing method

A dew formation testing device for performing dew formation testing, the device comprising:

• an adjustment unit capable of adjusting temperature and humidity of air to predetermined temperature and humidity;
• a testing tank installed separately from the adjustment unit and provided with a sample base that has a mounting surface, onto which a testing sample can be placed, and that is capable to cool the mounting surface;
• and
• a duct linking the adjustment unit and the testing tank, wherein
• the testing tank is provided with an air guide member that, when air flowing into the testing tank through the duct flows onto the sample base from a side of the sample base, guides the air in a direction tilted downward at a predetermined angle, the guidance being performed at a position right above the sample base at an end thereof which is on the upstream side of the air flow.