To provide a measuring system capable of measuring simply.

This measuring system 1 for measuring the volume or the number of contents in a container 10 is equipped with an RFID tag 20 mounted on the container 10; and a reader/writer device 30 arranged in the range communicable with the RFID tag 20, for communicating with the RFID tag 20. In the incommunicable case with the RFID tag 20 caused by water blocking communication, the reader/writer device 30 detects that water exists in the periphery of the incommunicable RFID tag 20, and in the communicable case with the RFID tag 20, the device 30 detects that water does not exist in the periphery of the communicable RFID tag 20.