A wireless device comprising: a sensor unit including: an input/output unit (lla-c) configured to perform measurement and/or manipulation of a state quantity in a process; a first local communication unit configured to perform local communication to transmit/receive measurement results by the input/output unit (lla-c) and/or manipulation commands for the input/output unit (11a-c); and a first supply unit configured to supply power to the input/output unit (lla-c) and the first local communication unit; a wireless unit including: a wireless communication unit configured to transmit/receive the measurement results by the input/output unit (lla-c) and/or the manipulation commands for the input/output unit (11a-c); a second local communication unit configured to perform local communication with the first local communication unit to transmit/receive the measurement results by the input/output unit (lla-c) and/or the manipulation commands for the input/output unit (11a-c); and a second supply unit configured to supply power to the wireless communication unit and the second local communication unit; wherein the wireless unit is configured to transmit to the sensor unit wireless unit setting information used for setting the wireless unit via the local communication through the first local communication unit and the second local communication unit, and wherein the sensor unit is configured to transmit to the wireless unit the wireless unit setting information via the local communication through the first local communication unit and the second local communication unit, and if the wireless unit receives the wireless unit setting information, the wireless unit is configured to perform setting of the wireless unit based on the received wireless unit setting information. a sensor unit including: an input/output unit (lla-c) configured to perform measurement and/or manipulation of a state quantity in a process; a first local communication unit configured to perform local communication to transmit/receive measurement results by the input/output unit (lla-c) and/or manipulation commands for the input/output unit (11a-c); and a first supply unit configured to supply power to the input/output unit (lla-c) and the first local communication unit; an input/output unit (lla-c) configured to perform measurement and/or manipulation of a state quantity in a process; a first local communication unit configured to perform local communication to transmit/receive measurement results by the input/output unit (lla-c) and/or manipulation commands for the input/output unit (11a-c); and a first supply unit configured to supply power to the input/output unit (lla-c) and the first local communication unit; a wireless unit including: a wireless communication unit configured to transmit/receive the measurement results by the input/output unit (lla-c) and/or the manipulation commands for the input/output unit (11a-c); a second local communication unit configured to perform local communication with the first local communication unit to transmit/receive the measurement results by the input/output unit (lla-c) and/or the manipulation commands for the input/output unit (11a-c); and a second supply unit configured to supply power to the wireless communication unit and the second local communication unit; wherein the wireless unit is configured to transmit to the sensor unit wireless unit setting information used for setting the wireless unit via the local communication through the first local communication unit and the second local communication unit, and wherein the sensor unit is configured to transmit to the wireless unit the wireless unit setting information via the local communication through the first local communication unit and the second local communication unit, and a wireless communication unit configured to transmit/receive the measurement results by the input/output unit (lla-c) and/or the manipulation commands for the input/output unit (11a-c); a second local communication unit configured to perform local communication with the first local communication unit to transmit/receive the measurement results by the input/output unit (lla-c) and/or the manipulation commands for the input/output unit (11a-c); and a second supply unit configured to supply power to the wireless communication unit and the second local communication unit; wherein the wireless unit is configured to transmit to the sensor unit wireless unit setting information used for setting the wireless unit via the local communication through the first local communication unit and the second local communication unit, and wherein the sensor unit is configured to transmit to the wireless unit the wireless unit setting information via the local communication through the first local communication unit and the second local communication unit, and if the wireless unit receives the wireless unit setting information, the wireless unit is configured to perform setting of the wireless unit based on the received wireless unit setting information.