To detect exact tire information, that is, tire air pressure and tire temperature, etc., even if output characteristics of sensors disperse.

This device is provided with an interrogator 20 provided in a main body of a vehicle 1 to transmit a question signal and a transponder 11 mounted on each tire 2 of the vehicle 1 to return the tire information such as tire air pressure corresponding to the question signal to the interrogator 20. The transponder 11 is provided with one or more than sensors 13a and 13b for detecting the tire information and a sensor specifying means 14 for specifying characteristics of the sensors 13a and 13b. The interrogator 20 is provided with a control means 45 for processing the tire information and a correction table for correcting the characteristics of the sensors 13a and 13b specified by the sensor specifying means 14. The control means 45 corrects the tire information by the correction table to output data related to the tire information.