HUMIDITY MEASUREMENT DEVICE

In order to provide a humidity measuring device capable of determining whether or not a detection value by a humidity sensor is valid, a humidity measuring device of the present invention is a humidity measuring device for measuring humidity of the intake air in an internal-combustion engine 2, and includes a water droplet adhesion determination means 51 for determining whether or not a water droplet adheres to a surface of a sensor element 22 of a humidity sensor 21, based on changes in the humidity and the temperature of the intake air. Thus, it is possible to determine whether or not a detection value by the humidity sensor 21 is valid.