To solve the problems of difficulty in accurately and stably measuring and recording temperature and humidity for a long time due to deterioration of a temperature/humidity measurement element of a temperature and humidity recorder, which measures and records temperature and humidity while being directly exposed to an outside air.

A ventilation filter 1 is attached to a temperature/humidity-sensitive window 2 so as to prevent a temperature element and a humidity element from coming in direct contact with an outside air, thereby protecting the temperature element and the humidity element and preventing deterioration. Consequently, it is possible to accurately and stably measure and record temperature and humidity for a long time.