A tire device is provided with: a vibratory power generation element (11); a signal processing unit (14); and a transmitter (15). The vibratory power generation element is disposed inside a tire and outputs a voltage corresponding to a temporal change in vibrations caused in a tire tread. The signal processing unit is disposed inside the tire and performs signal processing on the output voltage from the vibratory power generation element. The transmitter is disposed inside the tire and transmits data obtained by the signal processing by the signal processing unit to a device provided outside the tire. The signal processing unit and the transmitter are driven by electric power generated by the vibratory power generation element.
