To efficiently and precisely carry out conversion processing from a detected value into a measured value by a radio sensor.

This radio sensor 100 of the present invention is provided with: a plurality of sensors 101, 102, 103, etc.; an A/D converter 110 for digital-converting the detected values by the plurality of sensors 101, 102, 103, etc.; a CPU 120 for converting the digital-converted detection values into measured values by substituting a least square approximation polynomial with the digital-converted detection values; and a radio transmission part 140 for transmitting the obtained measured values by a radio wave. A degree of the least square approximation polynomial used for the conversion from the detected values into the measured values is set in degrees met to characteristics of the respective sensors and different each other. The conversion processing from detected values into the measured values is efficiently and precisely carried out by this manner.