To provide a sensor authentication registration system capable of easily performing authentication and registration while avoiding external fraudulent registration.SOLUTION: A sensor authentication registration system 1 includes plural sensors 10 which are mounted on one or two or more object-of-sensing apparatuses 19 disposed within an object-of-management area, and each of which detects a state quantity of the object-of-sensing apparatus 19, and a designation apparatus 20 that stores each piece of mounting information on the plural sensors 10. The plural sensors 10 and designation apparatus 20 can mutually wirelessly communicate. A radio wave strength measurement unit that measures the strength of a radio wave sent during wireless communication is incorporated in at least one of the sensors 10 and designation apparatus 20. When detecting presence of the sensor 10 whose mounting information is not stored, the designation apparatus 20 can accept an authentication operation with which mounting information is stored when the strength of the radio wave measured by the radio wave strength measurement unit is equal to or larger than a threshold.SELECTED DRAWING: Figure 1