A method for securing a communication network is provided. The tire balance measuring device of this invention comprises a sensor for measuring the inclination of the lock shaft, and a computing unit for computing an amount of change in a unbalance of the tire from an output value received from the sensor after the tire is supplied with gas, and correcting a result of measuring a balance of the tire using the computed amount of change in the unbalance. The current conductor structure provides a test magnetic field in response to a test signal, and a change in an electrical characteristic of the respective magnetic-field-sensitive structure is sensed.