Abstract: A sensor authentication registration system includes: sensors for detecting a state quantity of a sensing target device; and setting device that stores installation information for each of the sensors. A radio wave intensity measurement unit that measures intensity of a radio wave in wireless communication is provided to at least one of the sensors or the setting device. The setting device can perform an authentication operation to store the installation information when the presence of a sensor, the installation information of which is not stored, is detected and the radio wave intensity is equal to or higher than a threshold value. A data collection system includes: sensors; and data collection device that stores installation information for each of the sensors and receives state quantities detected by the sensors via wireless communication.