The present invention is a corrosive environment diagnosis system provided with: an environment measurement device including a temperature sensor for measuring the temperature inside a room in which an electronic component as a diagnosis object or an electronic device having the electronic component is installed, a humidity sensor for measuring the relative humidity in the room or the electronic device, a corrosion sensor for measuring the thickness of corrosion as a diagnosis object, and a database for accumulating indoor environment data including the temperature and relative humidity measured by the temperature sensor and the humidity sensor, and corrosion thickness data including the thickness of corrosion measured by the corrosion sensor; an outside air environment database in which outside air environment data including the past temperature and humidity of outside air are recorded; and a diagnosis processing device capable of receiving data of the outside air environment database and the environment measurement device; wherein the diagnosis processing device determines a corrosion mechanism corresponding to the relationship of the indoor environment data, the corrosion thickness data, and the outside air environment data, and estimates the future thickness of corrosion as a diagnosis object. The future thickness of corrosion can thereby be estimated with good precision on the basis of the mechanism of corrosion due to an atmosphere including a corrosive gas.
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