To provide a tire sensor unit to detect quantity of state of a tire while restraining unbalance of weight in the circumferential direction of the wheel and restraining increase of cost of the wheel and increase of the weight of the wheel.
A battery 20 and constitutional elements except for the battery 20 constituting this wheel sensor device 50 constituting the wheel sensor device 50 are arranged on the wheel 10 as they are respectively distributed on radial lines opened at an angle of roughly 180° in the circumferential direction of the wheel 10 on the wheel sensor device 50 to detect the quantity of state of the wheel 10. The battery 20 is arranged on a surface of a wheel rim 14 facing the outside of the vehicle. A pneumatic pressure sensor 24 to detect pneumatic pressure of the tire, a strain gage 18 to detect deformation of the tire and force given to the tire and a radio transmitter 22 to transmit the detected quantity of state of the wheel 10 to the car body by radio are included in the constitutional elements except for the battery 20.
Yusuke Murata
Tomoyuki Miki