Patent ID: 8342046

Claim:
An environmental test apparatus, comprising: a tank unit which selectively switches between state where inside gas is sealed and state where the inside gas is opened to the outside; a passage unit which, within the tank unit, defines an internal passage space for accommodating therein a test piece, the internal passage space being extended from an opening formed at one end to another opening formed at another end; a heater which heats gas inside the passage unit; a heater controller which controls the heater such that the temperature of the gas inside the passage unit becomes a set temperature; a humidifier which contains humidifying water and heats and evaporates the humidifying water to humidify the gas inside the passage unit; a humidifier controller which controls the humidifier to heat the humidifying water to a temperature lower than the set temperature such that the humidity of the gas inside the passage unit becomes a set humidity; and a heat conducting member made of material having higher thermal conductivity than that of gas inside the tank unit or the passage unit, the heat conducting member being disposed such that one end of the heat conducting member is positioned in the gas inside the tank unit and the other end is positioned in the humidifying water contained in the humidifier, wherein the heat conducting member and a water surface of the humidifying water intersect at a position apart from the other end relative to a direction along the water surface of the humidifying water.